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author | Ankur Dave <ankurdave@gmail.com> | 2014-01-08 21:19:08 -0800 |
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committer | Ankur Dave <ankurdave@gmail.com> | 2014-01-08 21:19:08 -0800 |
commit | 91227566bc9d8aabaec3f2a37a09a17afa20989c (patch) | |
tree | 80d19aac29217005b3f1cb08ca95fa08bbb9d946 /docs | |
parent | 7210257ba3038d5e22d4b60fe9c3113dc45c3dff (diff) | |
parent | 04d83fc37f9eef89c20331c85291a0a169f75e6d (diff) | |
download | spark-91227566bc9d8aabaec3f2a37a09a17afa20989c.tar.gz spark-91227566bc9d8aabaec3f2a37a09a17afa20989c.tar.bz2 spark-91227566bc9d8aabaec3f2a37a09a17afa20989c.zip |
Merge remote-tracking branch 'spark-upstream/master' into HEAD
Conflicts:
README.md
core/src/main/scala/org/apache/spark/util/collection/OpenHashMap.scala
core/src/main/scala/org/apache/spark/util/collection/OpenHashSet.scala
core/src/main/scala/org/apache/spark/util/collection/PrimitiveKeyOpenHashMap.scala
pom.xml
project/SparkBuild.scala
repl/src/main/scala/org/apache/spark/repl/SparkILoop.scala
Diffstat (limited to 'docs')
-rw-r--r-- | docs/_config.yml | 4 | ||||
-rwxr-xr-x | docs/_layouts/global.html | 8 | ||||
-rw-r--r-- | docs/_plugins/copy_api_dirs.rb | 2 | ||||
-rw-r--r-- | docs/bagel-programming-guide.md | 6 | ||||
-rw-r--r-- | docs/building-with-maven.md | 8 | ||||
-rw-r--r-- | docs/cluster-overview.md | 2 | ||||
-rw-r--r-- | docs/configuration.md | 175 | ||||
-rw-r--r-- | docs/css/bootstrap.min.css | 2 | ||||
-rw-r--r-- | docs/hadoop-third-party-distributions.md | 3 | ||||
-rw-r--r-- | docs/index.md | 18 | ||||
-rw-r--r-- | docs/java-programming-guide.md | 4 | ||||
-rw-r--r-- | docs/job-scheduling.md | 26 | ||||
-rw-r--r-- | docs/mllib-guide.md | 330 | ||||
-rw-r--r-- | docs/monitoring.md | 3 | ||||
-rw-r--r-- | docs/python-programming-guide.md | 43 | ||||
-rw-r--r-- | docs/quick-start.md | 66 | ||||
-rw-r--r-- | docs/running-on-mesos.md | 19 | ||||
-rw-r--r-- | docs/running-on-yarn.md | 54 | ||||
-rw-r--r-- | docs/scala-programming-guide.md | 20 | ||||
-rw-r--r-- | docs/spark-debugger.md | 2 | ||||
-rw-r--r-- | docs/spark-standalone.md | 51 | ||||
-rw-r--r-- | docs/streaming-programming-guide.md | 14 | ||||
-rw-r--r-- | docs/tuning.md | 22 |
23 files changed, 661 insertions, 221 deletions
diff --git a/docs/_config.yml b/docs/_config.yml index 48ecb8d0c9..11d18f0ac2 100644 --- a/docs/_config.yml +++ b/docs/_config.yml @@ -4,7 +4,7 @@ markdown: kramdown # These allow the documentation to be updated with nerw releases # of Spark, Scala, and Mesos. SPARK_VERSION: 0.9.0-incubating-SNAPSHOT -SPARK_VERSION_SHORT: 0.9.0-SNAPSHOT -SCALA_VERSION: 2.9.3 +SPARK_VERSION_SHORT: 0.9.0 +SCALA_VERSION: 2.10 MESOS_VERSION: 0.13.0 SPARK_ISSUE_TRACKER_URL: https://spark-project.atlassian.net diff --git a/docs/_layouts/global.html b/docs/_layouts/global.html index 0c1d657cde..ad7969d012 100755 --- a/docs/_layouts/global.html +++ b/docs/_layouts/global.html @@ -74,12 +74,12 @@ <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">API Docs<b class="caret"></b></a> <ul class="dropdown-menu"> - <li><a href="api/core/index.html">Spark Core for Java/Scala</a></li> + <li><a href="api/core/index.html#org.apache.spark.package">Spark Core for Java/Scala</a></li> <li><a href="api/pyspark/index.html">Spark Core for Python</a></li> <li class="divider"></li> - <li><a href="api/streaming/index.html">Spark Streaming</a></li> - <li><a href="api/mllib/index.html">MLlib (Machine Learning)</a></li> - <li><a href="api/bagel/index.html">Bagel (Pregel on Spark)</a></li> + <li><a href="api/streaming/index.html#org.apache.spark.streaming.package">Spark Streaming</a></li> + <li><a href="api/mllib/index.html#org.apache.spark.mllib.package">MLlib (Machine Learning)</a></li> + <li><a href="api/bagel/index.html#org.apache.spark.bagel.package">Bagel (Pregel on Spark)</a></li> </ul> </li> diff --git a/docs/_plugins/copy_api_dirs.rb b/docs/_plugins/copy_api_dirs.rb index c574ea7f5c..431de909cb 100644 --- a/docs/_plugins/copy_api_dirs.rb +++ b/docs/_plugins/copy_api_dirs.rb @@ -35,7 +35,7 @@ if not (ENV['SKIP_API'] == '1' or ENV['SKIP_SCALADOC'] == '1') # Copy over the scaladoc from each project into the docs directory. # This directory will be copied over to _site when `jekyll` command is run. projects.each do |project_name| - source = "../" + project_name + "/target/scala-2.9.3/api" + source = "../" + project_name + "/target/scala-2.10/api" dest = "api/" + project_name puts "echo making directory " + dest diff --git a/docs/bagel-programming-guide.md b/docs/bagel-programming-guide.md index 140190a38c..c4f1f6d6ad 100644 --- a/docs/bagel-programming-guide.md +++ b/docs/bagel-programming-guide.md @@ -106,7 +106,7 @@ _Example_ ## Operations -Here are the actions and types in the Bagel API. See [Bagel.scala](https://github.com/apache/incubator-spark/blob/master/bagel/src/main/scala/spark/bagel/Bagel.scala) for details. +Here are the actions and types in the Bagel API. See [Bagel.scala](https://github.com/apache/incubator-spark/blob/master/bagel/src/main/scala/org/apache/spark/bagel/Bagel.scala) for details. ### Actions @@ -157,8 +157,8 @@ trait Message[K] { # Where to Go from Here -Two example jobs, PageRank and shortest path, are included in `examples/src/main/scala/org/apache/spark/examples/bagel`. You can run them by passing the class name to the `run-example` script included in Spark; e.g.: +Two example jobs, PageRank and shortest path, are included in `examples/src/main/scala/org/apache/spark/examples/bagel`. You can run them by passing the class name to the `bin/run-example` script included in Spark; e.g.: - ./run-example org.apache.spark.examples.bagel.WikipediaPageRank + ./bin/run-example org.apache.spark.examples.bagel.WikipediaPageRank Each example program prints usage help when run without any arguments. diff --git a/docs/building-with-maven.md b/docs/building-with-maven.md index 19c01e179f..b9ff0af76f 100644 --- a/docs/building-with-maven.md +++ b/docs/building-with-maven.md @@ -37,14 +37,16 @@ For Apache Hadoop versions 1.x, Cloudera CDH MRv1, and other Hadoop versions wit # Cloudera CDH 4.2.0 with MapReduce v1 $ mvn -Dhadoop.version=2.0.0-mr1-cdh4.2.0 -DskipTests clean package -For Apache Hadoop 2.x, 0.23.x, Cloudera CDH MRv2, and other Hadoop versions with YARN, you should enable the "hadoop2-yarn" profile and set the "yarn.version" property: +For Apache Hadoop 2.x, 0.23.x, Cloudera CDH MRv2, and other Hadoop versions with YARN, you should enable the "yarn-alpha" or "yarn" profile and set the "hadoop.version", "yarn.version" property: # Apache Hadoop 2.0.5-alpha - $ mvn -Phadoop2-yarn -Dhadoop.version=2.0.5-alpha -Dyarn.version=2.0.5-alpha -DskipTests clean package + $ mvn -Pyarn-alpha -Dhadoop.version=2.0.5-alpha -Dyarn.version=2.0.5-alpha -DskipTests clean package # Cloudera CDH 4.2.0 with MapReduce v2 - $ mvn -Phadoop2-yarn -Dhadoop.version=2.0.0-cdh4.2.0 -Dyarn.version=2.0.0-chd4.2.0 -DskipTests clean package + $ mvn -Pyarn-alpha -Dhadoop.version=2.0.0-cdh4.2.0 -Dyarn.version=2.0.0-chd4.2.0 -DskipTests clean package + # Apache Hadoop 2.2.X ( e.g. 2.2.0 as below ) and newer + $ mvn -Pyarn -Dhadoop.version=2.2.0 -Dyarn.version=2.2.0 -DskipTests clean package ## Spark Tests in Maven ## diff --git a/docs/cluster-overview.md b/docs/cluster-overview.md index 5927f736f3..e16703292c 100644 --- a/docs/cluster-overview.md +++ b/docs/cluster-overview.md @@ -45,7 +45,7 @@ The system currently supports three cluster managers: easy to set up a cluster. * [Apache Mesos](running-on-mesos.html) -- a general cluster manager that can also run Hadoop MapReduce and service applications. -* [Hadoop YARN](running-on-yarn.html) -- the resource manager in Hadoop 2.0. +* [Hadoop YARN](running-on-yarn.html) -- the resource manager in Hadoop 2. In addition, Spark's [EC2 launch scripts](ec2-scripts.html) make it easy to launch a standalone cluster on Amazon EC2. diff --git a/docs/configuration.md b/docs/configuration.md index 97183bafdb..1d6c3d1633 100644 --- a/docs/configuration.md +++ b/docs/configuration.md @@ -3,26 +3,37 @@ layout: global title: Spark Configuration --- -Spark provides three main locations to configure the system: +Spark provides three locations to configure the system: -* [Java system properties](#system-properties), which control internal configuration parameters and can be set - either programmatically (by calling `System.setProperty` *before* creating a `SparkContext`) or through - JVM arguments. -* [Environment variables](#environment-variables) for configuring per-machine settings such as the IP address, - which can be set in the `conf/spark-env.sh` script. -* [Logging configuration](#configuring-logging), which is done through `log4j.properties`. +* [Spark properties](#spark-properties) control most application parameters and can be set by passing + a [SparkConf](api/core/index.html#org.apache.spark.SparkConf) object to SparkContext, or through Java + system properties. +* [Environment variables](#environment-variables) can be used to set per-machine settings, such as + the IP address, through the `conf/spark-env.sh` script on each node. +* [Logging](#configuring-logging) can be configured through `log4j.properties`. -# System Properties +# Spark Properties -To set a system property for configuring Spark, you need to either pass it with a -D flag to the JVM (for example `java -Dspark.cores.max=5 MyProgram`) or call `System.setProperty` in your code *before* creating your Spark context, as follows: +Spark properties control most application settings and are configured separately for each application. +The preferred way to set them is by passing a [SparkConf](api/core/index.html#org.apache.spark.SparkConf) +class to your SparkContext constructor. +Alternatively, Spark will also load them from Java system properties (for compatibility with old versions +of Spark) and from a [`spark.conf` file](#configuration-files) on your classpath. + +SparkConf lets you configure most of the common properties to initialize a cluster (e.g., master URL and +application name), as well as arbitrary key-value pairs through the `set()` method. For example, we could +initialize an application as follows: {% highlight scala %} -System.setProperty("spark.cores.max", "5") -val sc = new SparkContext(...) +val conf = new SparkConf() + .setMaster("local") + .setAppName("My application") + .set("spark.executor.memory", "1g") +val sc = new SparkContext(conf) {% endhighlight %} -Most of the configurable system properties control internal settings that have reasonable default values. However, +Most of the properties control internal settings that have reasonable default values. However, there are at least five properties that you will commonly want to control: <table class="table"> @@ -66,12 +77,14 @@ there are at least five properties that you will commonly want to control: </tr> <tr> <td>spark.cores.max</td> - <td>(infinite)</td> + <td>(not set)</td> <td> When running on a <a href="spark-standalone.html">standalone deploy cluster</a> or a <a href="running-on-mesos.html#mesos-run-modes">Mesos cluster in "coarse-grained" - sharing mode</a>, how many CPU cores to request at most. The default will use all available cores - offered by the cluster manager. + sharing mode</a>, the maximum amount of CPU cores to request for the application from + across the cluster (not from each machine). If not set, the default will be + <code>spark.deploy.defaultCores</code> on Spark's standalone cluster manager, or + infinite (all available cores) on Mesos. </td> </tr> </table> @@ -275,12 +288,33 @@ Apart from these, the following properties are also available, and may be useful </tr> <tr> <td>spark.akka.timeout</td> - <td>20</td> + <td>100</td> <td> Communication timeout between Spark nodes, in seconds. </td> </tr> <tr> + <td>spark.akka.heartbeat.pauses</td> + <td>600</td> + <td> + This is set to a larger value to disable failure detector that comes inbuilt akka. It can be enabled again, if you plan to use this feature (Not recommended). Acceptable heart beat pause in seconds for akka. This can be used to control sensitivity to gc pauses. Tune this in combination of `spark.akka.heartbeat.interval` and `spark.akka.failure-detector.threshold` if you need to. + </td> +</tr> +<tr> + <td>spark.akka.failure-detector.threshold</td> + <td>300.0</td> + <td> + This is set to a larger value to disable failure detector that comes inbuilt akka. It can be enabled again, if you plan to use this feature (Not recommended). This maps to akka's `akka.remote.transport-failure-detector.threshold`. Tune this in combination of `spark.akka.heartbeat.pauses` and `spark.akka.heartbeat.interval` if you need to. + </td> +</tr> +<tr> + <td>spark.akka.heartbeat.interval</td> + <td>1000</td> + <td> + This is set to a larger value to disable failure detector that comes inbuilt akka. It can be enabled again, if you plan to use this feature (Not recommended). A larger interval value in seconds reduces network overhead and a smaller value ( ~ 1 s) might be more informative for akka's failure detector. Tune this in combination of `spark.akka.heartbeat.pauses` and `spark.akka.failure-detector.threshold` if you need to. Only positive use case for using failure detector can be, a sensistive failure detector can help evict rogue executors really quick. However this is usually not the case as gc pauses and network lags are expected in a real spark cluster. Apart from that enabling this leads to a lot of exchanges of heart beats between nodes leading to flooding the network with those. + </td> +</tr> +<tr> <td>spark.driver.host</td> <td>(local hostname)</td> <td> @@ -327,14 +361,116 @@ Apart from these, the following properties are also available, and may be useful Too large a value decreases parallelism during broadcast (makes it slower); however, if it is too small, <code>BlockManager</code> might take a performance hit. </td> </tr> +<tr> + <td>akka.x.y....</td> + <td>value</td> + <td> + An arbitrary akka configuration can be set directly on spark conf and it is applied for all the ActorSystems created spark wide for that SparkContext and its assigned executors as well. + </td> +</tr> +<tr> + <td>spark.shuffle.consolidateFiles</td> + <td>false</td> + <td> + If set to "true", consolidates intermediate files created during a shuffle. Creating fewer files can improve filesystem performance for shuffles with large numbers of reduce tasks. It is recommended to set this to "true" when using ext4 or xfs filesystems. On ext3, this option might degrade performance on machines with many (>8) cores due to filesystem limitations. + </td> +</tr> +<tr> + <td>spark.speculation</td> + <td>false</td> + <td> + If set to "true", performs speculative execution of tasks. This means if one or more tasks are running slowly in a stage, they will be re-launched. + </td> +</tr> +<tr> + <td>spark.speculation.interval</td> + <td>100</td> + <td> + How often Spark will check for tasks to speculate, in milliseconds. + </td> +</tr> +<tr> + <td>spark.speculation.quantile</td> + <td>0.75</td> + <td> + Percentage of tasks which must be complete before speculation is enabled for a particular stage. + </td> +</tr> +<tr> + <td>spark.speculation.multiplier</td> + <td>1.5</td> + <td> + How many times slower a task is than the median to be considered for speculation. + </td> +</tr> +<tr> + <td>spark.logConf</td> + <td>false</td> + <td> + Log the supplied SparkConf as INFO at start of spark context. + </td> +</tr> +<tr> + <td>spark.deploy.spreadOut</td> + <td>true</td> + <td> + Whether the standalone cluster manager should spread applications out across nodes or try + to consolidate them onto as few nodes as possible. Spreading out is usually better for + data locality in HDFS, but consolidating is more efficient for compute-intensive workloads. <br/> + <b>Note:</b> this setting needs to be configured in the standalone cluster master, not in individual + applications; you can set it through <code>SPARK_JAVA_OPTS</code> in <code>spark-env.sh</code>. + </td> +</tr> +<tr> + <td>spark.deploy.defaultCores</td> + <td>(infinite)</td> + <td> + Default number of cores to give to applications in Spark's standalone mode if they don't + set <code>spark.cores.max</code>. If not set, applications always get all available + cores unless they configure <code>spark.cores.max</code> themselves. + Set this lower on a shared cluster to prevent users from grabbing + the whole cluster by default. <br/> + <b>Note:</b> this setting needs to be configured in the standalone cluster master, not in individual + applications; you can set it through <code>SPARK_JAVA_OPTS</code> in <code>spark-env.sh</code>. + </td> +</tr> </table> +## Viewing Spark Properties + +The application web UI at `http://<driver>:4040` lists Spark properties in the "Environment" tab. +This is a useful place to check to make sure that your properties have been set correctly. + +## Configuration Files + +You can also configure Spark properties through a `spark.conf` file on your Java classpath. +Because these properties are usually application-specific, we recommend putting this fine *only* on your +application's classpath, and not in a global Spark classpath. + +The `spark.conf` file uses Typesafe Config's [HOCON format](https://github.com/typesafehub/config#json-superset), +which is a superset of Java properties files and JSON. For example, the following is a simple config file: + +{% highlight awk %} +# Comments are allowed +spark.executor.memory = 512m +spark.serializer = org.apache.spark.serializer.KryoSerializer +{% endhighlight %} + +The format also allows hierarchical nesting, as follows: + +{% highlight awk %} +spark.akka { + threads = 8 + timeout = 200 +} +{% endhighlight %} + # Environment Variables -Certain Spark settings can also be configured through environment variables, which are read from the `conf/spark-env.sh` +Certain Spark settings can be configured through environment variables, which are read from the `conf/spark-env.sh` script in the directory where Spark is installed (or `conf/spark-env.cmd` on Windows). These variables are meant to be for machine-specific settings, such -as library search paths. While Java system properties can also be set here, for application settings, we recommend setting +as library search paths. While Spark properties can also be set there through `SPARK_JAVA_OPTS`, for per-application settings, we recommend setting these properties within the application instead of in `spark-env.sh` so that different applications can use different settings. @@ -351,7 +487,8 @@ The following variables can be set in `spark-env.sh`: Note that applications can also add dependencies for themselves through `SparkContext.addJar` -- we recommend doing that when possible. * `SPARK_JAVA_OPTS`, to add JVM options. This includes Java options like garbage collector settings and any system - properties that you'd like to pass with `-D` (e.g., `-Dspark.local.dir=/disk1,/disk2`). + properties that you'd like to pass with `-D`. One use case is to set some Spark properties differently on this + machine, e.g., `-Dspark.local.dir=/disk1,/disk2`. * Options for the Spark [standalone cluster scripts](spark-standalone.html#cluster-launch-scripts), such as number of cores to use on each machine and maximum memory. diff --git a/docs/css/bootstrap.min.css b/docs/css/bootstrap.min.css index ccb529eaba..30ea440c00 100644 --- a/docs/css/bootstrap.min.css +++ b/docs/css/bootstrap.min.css @@ -6,4 +6,4 @@ * http://www.apache.org/licenses/LICENSE-2.0 * * Designed and built with all the love in the world @twitter by @mdo and @fat. - */article,aside,details,figcaption,figure,footer,header,hgroup,nav,section{display:block}audio,canvas,video{display:inline-block;*display:inline;*zoom:1}audio:not([controls]){display:none}html{font-size:100%;-webkit-text-size-adjust:100%;-ms-text-size-adjust:100%}a:focus{outline:thin dotted #333;outline:5px auto 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b/docs/hadoop-third-party-distributions.md index b33af2cf24..de6a2b0a43 100644 --- a/docs/hadoop-third-party-distributions.md +++ b/docs/hadoop-third-party-distributions.md @@ -10,7 +10,7 @@ with these distributions: # Compile-time Hadoop Version When compiling Spark, you'll need to -[set the SPARK_HADOOP_VERSION flag](http://localhost:4000/index.html#a-note-about-hadoop-versions): +[set the SPARK_HADOOP_VERSION flag](index.html#a-note-about-hadoop-versions): SPARK_HADOOP_VERSION=1.0.4 sbt/sbt assembly @@ -40,6 +40,7 @@ the _exact_ Hadoop version you are running to avoid any compatibility errors. <tr><td>HDP 1.2</td><td>1.1.2</td></tr> <tr><td>HDP 1.1</td><td>1.0.3</td></tr> <tr><td>HDP 1.0</td><td>1.0.3</td></tr> + <tr><td>HDP 2.0</td><td>2.2.0</td></tr> </table> </td> </tr> diff --git a/docs/index.md b/docs/index.md index bd386a8a8f..86d574daaa 100644 --- a/docs/index.md +++ b/docs/index.md @@ -24,9 +24,9 @@ For its Scala API, Spark {{site.SPARK_VERSION}} depends on Scala {{site.SCALA_VE # Running the Examples and Shell Spark comes with several sample programs in the `examples` directory. -To run one of the samples, use `./run-example <class> <params>` in the top-level Spark directory -(the `run-example` script sets up the appropriate paths and launches that program). -For example, try `./run-example org.apache.spark.examples.SparkPi local`. +To run one of the samples, use `./bin/run-example <class> <params>` in the top-level Spark directory +(the `bin/run-example` script sets up the appropriate paths and launches that program). +For example, try `./bin/run-example org.apache.spark.examples.SparkPi local`. Each example prints usage help when run with no parameters. Note that all of the sample programs take a `<master>` parameter specifying the cluster URL @@ -34,8 +34,8 @@ to connect to. This can be a [URL for a distributed cluster](scala-programming-g or `local` to run locally with one thread, or `local[N]` to run locally with N threads. You should start by using `local` for testing. -Finally, you can run Spark interactively through modified versions of the Scala shell (`./spark-shell`) or -Python interpreter (`./pyspark`). These are a great way to learn the framework. +Finally, you can run Spark interactively through modified versions of the Scala shell (`./bin/spark-shell`) or +Python interpreter (`./bin/pyspark`). These are a great way to learn the framework. # Launching on a Cluster @@ -56,14 +56,16 @@ Hadoop, you must build Spark against the same version that your cluster uses. By default, Spark links to Hadoop 1.0.4. You can change this by setting the `SPARK_HADOOP_VERSION` variable when compiling: - SPARK_HADOOP_VERSION=1.2.1 sbt/sbt assembly + SPARK_HADOOP_VERSION=2.2.0 sbt/sbt assembly -In addition, if you wish to run Spark on [YARN](running-on-yarn.md), set +In addition, if you wish to run Spark on [YARN](running-on-yarn.html), set `SPARK_YARN` to `true`: SPARK_HADOOP_VERSION=2.0.5-alpha SPARK_YARN=true sbt/sbt assembly -(Note that on Windows, you need to set the environment variables on separate lines, e.g., `set SPARK_HADOOP_VERSION=1.2.1`.) +Note that on Windows, you need to set the environment variables on separate lines, e.g., `set SPARK_HADOOP_VERSION=1.2.1`. + +For this version of Spark (0.8.1) Hadoop 2.2.x (or newer) users will have to build Spark and publish it locally. See [Launching Spark on YARN](running-on-yarn.html). This is needed because Hadoop 2.2 has non backwards compatible API changes. # Where to Go from Here diff --git a/docs/java-programming-guide.md b/docs/java-programming-guide.md index 53085cc671..07732fa122 100644 --- a/docs/java-programming-guide.md +++ b/docs/java-programming-guide.md @@ -190,9 +190,9 @@ We hope to generate documentation with Java-style syntax in the future. Spark includes several sample programs using the Java API in [`examples/src/main/java`](https://github.com/apache/incubator-spark/tree/master/examples/src/main/java/org/apache/spark/examples). You can run them by passing the class name to the -`run-example` script included in Spark; for example: +`bin/run-example` script included in Spark; for example: - ./run-example org.apache.spark.examples.JavaWordCount + ./bin/run-example org.apache.spark.examples.JavaWordCount Each example program prints usage help when run without any arguments. diff --git a/docs/job-scheduling.md b/docs/job-scheduling.md index d304c5497b..df2faa5e41 100644 --- a/docs/job-scheduling.md +++ b/docs/job-scheduling.md @@ -32,12 +32,11 @@ Resource allocation can be configured as follows, based on the cluster type: * **Standalone mode:** By default, applications submitted to the standalone mode cluster will run in FIFO (first-in-first-out) order, and each application will try to use all available nodes. You can limit - the number of nodes an application uses by setting the `spark.cores.max` system property in it. This - will allow multiple users/applications to run concurrently. For example, you might launch a long-running - server that uses 10 cores, and allow users to launch shells that use 20 cores each. + the number of nodes an application uses by setting the `spark.cores.max` configuration property in it, + or change the default for applications that don't set this setting through `spark.deploy.defaultCores`. Finally, in addition to controlling cores, each application's `spark.executor.memory` setting controls its memory use. -* **Mesos:** To use static partitioning on Mesos, set the `spark.mesos.coarse` system property to `true`, +* **Mesos:** To use static partitioning on Mesos, set the `spark.mesos.coarse` configuration property to `true`, and optionally set `spark.cores.max` to limit each application's resource share as in the standalone mode. You should also set `spark.executor.memory` to control the executor memory. * **YARN:** The `--num-workers` option to the Spark YARN client controls how many workers it will allocate @@ -78,11 +77,13 @@ of cluster resources. This means that short jobs submitted while a long job is r resources right away and still get good response times, without waiting for the long job to finish. This mode is best for multi-user settings. -To enable the fair scheduler, simply set the `spark.scheduler.mode` to `FAIR` before creating +To enable the fair scheduler, simply set the `spark.scheduler.mode` property to `FAIR` when configuring a SparkContext: {% highlight scala %} -System.setProperty("spark.scheduler.mode", "FAIR") +val conf = new SparkConf().setMaster(...).setAppName(...) +conf.set("spark.scheduler.mode", "FAIR") +val sc = new SparkContext(conf) {% endhighlight %} ## Fair Scheduler Pools @@ -91,15 +92,15 @@ The fair scheduler also supports grouping jobs into _pools_, and setting differe (e.g. weight) for each pool. This can be useful to create a "high-priority" pool for more important jobs, for example, or to group the jobs of each user together and give _users_ equal shares regardless of how many concurrent jobs they have instead of giving _jobs_ equal shares. This approach is modeled after the -[Hadoop Fair Scheduler](http://hadoop.apache.org/docs/stable/fair_scheduler.html). +[Hadoop Fair Scheduler](http://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/FairScheduler.html). Without any intervention, newly submitted jobs go into a _default pool_, but jobs' pools can be set by adding the `spark.scheduler.pool` "local property" to the SparkContext in the thread that's submitting them. This is done as follows: {% highlight scala %} -// Assuming context is your SparkContext variable -context.setLocalProperty("spark.scheduler.pool", "pool1") +// Assuming sc is your SparkContext variable +sc.setLocalProperty("spark.scheduler.pool", "pool1") {% endhighlight %} After setting this local property, _all_ jobs submitted within this thread (by calls in this thread @@ -108,7 +109,7 @@ it easy to have a thread run multiple jobs on behalf of the same user. If you'd pool that a thread is associated with, simply call: {% highlight scala %} -context.setLocalProperty("spark.scheduler.pool", null) +sc.setLocalProperty("spark.scheduler.pool", null) {% endhighlight %} ## Default Behavior of Pools @@ -138,10 +139,11 @@ properties: of the cluster. By default, each pool's `minShare` is 0. The pool properties can be set by creating an XML file, similar to `conf/fairscheduler.xml.template`, -and setting the `spark.scheduler.allocation.file` property: +and setting a `spark.scheduler.allocation.file` property in your +[SparkConf](configuration.html#spark-properties). {% highlight scala %} -System.setProperty("spark.scheduler.allocation.file", "/path/to/file") +conf.set("spark.scheduler.allocation.file", "/path/to/file") {% endhighlight %} The format of the XML file is simply a `<pool>` element for each pool, with different elements diff --git a/docs/mllib-guide.md b/docs/mllib-guide.md index c1ff9c417c..45ee166688 100644 --- a/docs/mllib-guide.md +++ b/docs/mllib-guide.md @@ -3,6 +3,9 @@ layout: global title: Machine Learning Library (MLlib) --- +* Table of contents +{:toc} + MLlib is a Spark implementation of some common machine learning (ML) functionality, as well associated tests and data generators. MLlib currently supports four common types of machine learning problem settings, @@ -39,57 +42,6 @@ underlying gradient descent primitive (described parameter (*regParam*) along with various parameters associated with gradient descent (*stepSize*, *numIterations*, *miniBatchFraction*). -The following code snippet illustrates how to load a sample dataset, execute a -training algorithm on this training data using a static method in the algorithm -object, and make predictions with the resulting model to compute the training -error. - -{% highlight scala %} -import org.apache.spark.SparkContext -import org.apache.spark.mllib.classification.SVMWithSGD -import org.apache.spark.mllib.regression.LabeledPoint - -// Load and parse the data file -val data = sc.textFile("mllib/data/sample_svm_data.txt") -val parsedData = data.map { line => - val parts = line.split(' ') - LabeledPoint(parts(0).toDouble, parts.tail.map(x => x.toDouble).toArray) -} - -// Run training algorithm -val numIterations = 20 -val model = SVMWithSGD.train(parsedData, numIterations) - -// Evaluate model on training examples and compute training error -val labelAndPreds = parsedData.map { point => - val prediction = model.predict(point.features) - (point.label, prediction) -} -val trainErr = labelAndPreds.filter(r => r._1 != r._2).count.toDouble / parsedData.count -println("trainError = " + trainErr) -{% endhighlight %} - -The `SVMWithSGD.train()` method by default performs L2 regularization with the -regularization parameter set to 1.0. If we want to configure this algorithm, we -can customize `SVMWithSGD` further by creating a new object directly and -calling setter methods. All other MLlib algorithms support customization in -this way as well. For example, the following code produces an L1 regularized -variant of SVMs with regularization parameter set to 0.1, and runs the training -algorithm for 200 iterations. - -{% highlight scala %} -import org.apache.spark.mllib.optimization.L1Updater - -val svmAlg = new SVMWithSGD() -svmAlg.optimizer.setNumIterations(200) - .setRegParam(0.1) - .setUpdater(new L1Updater) -val modelL1 = svmAlg.run(parsedData) -{% endhighlight %} - -Both of the code snippets above can be executed in `spark-shell` to generate a -classifier for the provided dataset. - Available algorithms for binary classification: * [SVMWithSGD](api/mllib/index.html#org.apache.spark.mllib.classification.SVMWithSGD) @@ -121,14 +73,14 @@ of entities with one another based on some notion of similarity. Clustering is often used for exploratory analysis and/or as a component of a hierarchical supervised learning pipeline (in which distinct classifiers or regression models are trained for each cluster). MLlib supports -[k-means](http://en.wikipedia.org/wiki/K-means_clustering) clustering, arguably -the most commonly used clustering approach that clusters the data points into -*k* clusters. The MLlib implementation includes a parallelized +[k-means](http://en.wikipedia.org/wiki/K-means_clustering) clustering, one of +the most commonly used clustering algorithms that clusters the data points into +predfined number of clusters. The MLlib implementation includes a parallelized variant of the [k-means++](http://en.wikipedia.org/wiki/K-means%2B%2B) method called [kmeans||](http://theory.stanford.edu/~sergei/papers/vldb12-kmpar.pdf). The implementation in MLlib has the following parameters: -* *k* is the number of clusters. +* *k* is the number of desired clusters. * *maxIterations* is the maximum number of iterations to run. * *initializationMode* specifies either random initialization or initialization via k-means\|\|. @@ -169,7 +121,7 @@ the entries in the user-item matrix as *explicit* preferences given by the user It is common in many real-world use cases to only have access to *implicit feedback* (e.g. views, clicks, purchases, likes, shares etc.). The approach used in MLlib to deal with such data is taken from -[Collaborative Filtering for Implicit Feedback Datasets](http://research.yahoo.com/pub/2433). +[Collaborative Filtering for Implicit Feedback Datasets](http://www2.research.att.com/~yifanhu/PUB/cf.pdf). Essentially instead of trying to model the matrix of ratings directly, this approach treats the data as a combination of binary preferences and *confidence values*. The ratings are then related to the level of confidence in observed user preferences, rather than explicit ratings given to items. @@ -210,3 +162,269 @@ at each iteration. Available algorithms for gradient descent: * [GradientDescent](api/mllib/index.html#org.apache.spark.mllib.optimization.GradientDescent) + +# Using MLLib in Scala + +Following code snippets can be executed in `spark-shell`. + +## Binary Classification + +The following code snippet illustrates how to load a sample dataset, execute a +training algorithm on this training data using a static method in the algorithm +object, and make predictions with the resulting model to compute the training +error. + +{% highlight scala %} +import org.apache.spark.SparkContext +import org.apache.spark.mllib.classification.SVMWithSGD +import org.apache.spark.mllib.regression.LabeledPoint + +// Load and parse the data file +val data = sc.textFile("mllib/data/sample_svm_data.txt") +val parsedData = data.map { line => + val parts = line.split(' ') + LabeledPoint(parts(0).toDouble, parts.tail.map(x => x.toDouble).toArray) +} + +// Run training algorithm to build the model +val numIterations = 20 +val model = SVMWithSGD.train(parsedData, numIterations) + +// Evaluate model on training examples and compute training error +val labelAndPreds = parsedData.map { point => + val prediction = model.predict(point.features) + (point.label, prediction) +} +val trainErr = labelAndPreds.filter(r => r._1 != r._2).count.toDouble / parsedData.count +println("Training Error = " + trainErr) +{% endhighlight %} + + +The `SVMWithSGD.train()` method by default performs L2 regularization with the +regularization parameter set to 1.0. If we want to configure this algorithm, we +can customize `SVMWithSGD` further by creating a new object directly and +calling setter methods. All other MLlib algorithms support customization in +this way as well. For example, the following code produces an L1 regularized +variant of SVMs with regularization parameter set to 0.1, and runs the training +algorithm for 200 iterations. + +{% highlight scala %} +import org.apache.spark.mllib.optimization.L1Updater + +val svmAlg = new SVMWithSGD() +svmAlg.optimizer.setNumIterations(200) + .setRegParam(0.1) + .setUpdater(new L1Updater) +val modelL1 = svmAlg.run(parsedData) +{% endhighlight %} + +## Linear Regression +The following example demonstrate how to load training data, parse it as an RDD of LabeledPoint. The +example then uses LinearRegressionWithSGD to build a simple linear model to predict label values. We +compute the Mean Squared Error at the end to evaluate +[goodness of fit](http://en.wikipedia.org/wiki/Goodness_of_fit) + +{% highlight scala %} +import org.apache.spark.mllib.regression.LinearRegressionWithSGD +import org.apache.spark.mllib.regression.LabeledPoint + +// Load and parse the data +val data = sc.textFile("mllib/data/ridge-data/lpsa.data") +val parsedData = data.map { line => + val parts = line.split(',') + LabeledPoint(parts(0).toDouble, parts(1).split(' ').map(x => x.toDouble).toArray) +} + +// Building the model +val numIterations = 20 +val model = LinearRegressionWithSGD.train(parsedData, numIterations) + +// Evaluate model on training examples and compute training error +val valuesAndPreds = parsedData.map { point => + val prediction = model.predict(point.features) + (point.label, prediction) +} +val MSE = valuesAndPreds.map{ case(v, p) => math.pow((v - p), 2)}.reduce(_ + _)/valuesAndPreds.count +println("training Mean Squared Error = " + MSE) +{% endhighlight %} + + +Similarly you can use RidgeRegressionWithSGD and LassoWithSGD and compare training +[Mean Squared Errors](http://en.wikipedia.org/wiki/Mean_squared_error). + +## Clustering +In the following example after loading and parsing data, we use the KMeans object to cluster the data +into two clusters. The number of desired clusters is passed to the algorithm. We then compute Within +Set Sum of Squared Error (WSSSE). You can reduce this error measure by increasing *k*. In fact the +optimal *k* is usually one where there is an "elbow" in the WSSSE graph. + +{% highlight scala %} +import org.apache.spark.mllib.clustering.KMeans + +// Load and parse the data +val data = sc.textFile("kmeans_data.txt") +val parsedData = data.map( _.split(' ').map(_.toDouble)) + +// Cluster the data into two classes using KMeans +val numIterations = 20 +val numClusters = 2 +val clusters = KMeans.train(parsedData, numClusters, numIterations) + +// Evaluate clustering by computing Within Set Sum of Squared Errors +val WSSSE = clusters.computeCost(parsedData) +println("Within Set Sum of Squared Errors = " + WSSSE) +{% endhighlight %} + + +## Collaborative Filtering +In the following example we load rating data. Each row consists of a user, a product and a rating. +We use the default ALS.train() method which assumes ratings are explicit. We evaluate the recommendation +model by measuring the Mean Squared Error of rating prediction. + +{% highlight scala %} +import org.apache.spark.mllib.recommendation.ALS +import org.apache.spark.mllib.recommendation.Rating + +// Load and parse the data +val data = sc.textFile("mllib/data/als/test.data") +val ratings = data.map(_.split(',') match { + case Array(user, item, rate) => Rating(user.toInt, item.toInt, rate.toDouble) +}) + +// Build the recommendation model using ALS +val numIterations = 20 +val model = ALS.train(ratings, 1, 20, 0.01) + +// Evaluate the model on rating data +val usersProducts = ratings.map{ case Rating(user, product, rate) => (user, product)} +val predictions = model.predict(usersProducts).map{ + case Rating(user, product, rate) => ((user, product), rate) +} +val ratesAndPreds = ratings.map{ + case Rating(user, product, rate) => ((user, product), rate) +}.join(predictions) +val MSE = ratesAndPreds.map{ + case ((user, product), (r1, r2)) => math.pow((r1- r2), 2) +}.reduce(_ + _)/ratesAndPreds.count +println("Mean Squared Error = " + MSE) +{% endhighlight %} + +If the rating matrix is derived from other source of information (i.e., it is inferred from +other signals), you can use the trainImplicit method to get better results. + +{% highlight scala %} +val model = ALS.trainImplicit(ratings, 1, 20, 0.01) +{% endhighlight %} + +# Using MLLib in Python +Following examples can be tested in the PySpark shell. + +## Binary Classification +The following example shows how to load a sample dataset, build Logistic Regression model, +and make predictions with the resulting model to compute the training error. + +{% highlight python %} +from pyspark.mllib.classification import LogisticRegressionWithSGD +from numpy import array + +# Load and parse the data +data = sc.textFile("mllib/data/sample_svm_data.txt") +parsedData = data.map(lambda line: array([float(x) for x in line.split(' ')])) +model = LogisticRegressionWithSGD.train(sc, parsedData) + +# Build the model +labelsAndPreds = parsedData.map(lambda point: (int(point.item(0)), + model.predict(point.take(range(1, point.size))))) + +# Evaluating the model on training data +trainErr = labelsAndPreds.filter(lambda (v, p): v != p).count() / float(parsedData.count()) +print("Training Error = " + str(trainErr)) +{% endhighlight %} + +## Linear Regression +The following example demonstrate how to load training data, parse it as an RDD of LabeledPoint. The +example then uses LinearRegressionWithSGD to build a simple linear model to predict label values. We +compute the Mean Squared Error at the end to evaluate +[goodness of fit](http://en.wikipedia.org/wiki/Goodness_of_fit) + +{% highlight python %} +from pyspark.mllib.regression import LinearRegressionWithSGD +from numpy import array + +# Load and parse the data +data = sc.textFile("mllib/data/ridge-data/lpsa.data") +parsedData = data.map(lambda line: array([float(x) for x in line.replace(',', ' ').split(' ')])) + +# Build the model +model = LinearRegressionWithSGD.train(sc, parsedData) + +# Evaluate the model on training data +valuesAndPreds = parsedData.map(lambda point: (point.item(0), + model.predict(point.take(range(1, point.size))))) +MSE = valuesAndPreds.map(lambda (v, p): (v - p)**2).reduce(lambda x, y: x + y)/valuesAndPreds.count() +print("Mean Squared Error = " + str(MSE)) +{% endhighlight %} + + +## Clustering +In the following example after loading and parsing data, we use the KMeans object to cluster the data +into two clusters. The number of desired clusters is passed to the algorithm. We then compute Within +Set Sum of Squared Error (WSSSE). You can reduce this error measure by increasing *k*. In fact the +optimal *k* is usually one where there is an "elbow" in the WSSSE graph. + +{% highlight python %} +from pyspark.mllib.clustering import KMeans +from numpy import array +from math import sqrt + +# Load and parse the data +data = sc.textFile("kmeans_data.txt") +parsedData = data.map(lambda line: array([float(x) for x in line.split(' ')])) + +# Build the model (cluster the data) +clusters = KMeans.train(sc, parsedData, 2, maxIterations=10, + runs=30, initialization_mode="random") + +# Evaluate clustering by computing Within Set Sum of Squared Errors +def error(point): + center = clusters.centers[clusters.predict(point)] + return sqrt(sum([x**2 for x in (point - center)])) + +WSSSE = parsedData.map(lambda point: error(point)).reduce(lambda x, y: x + y) +print("Within Set Sum of Squared Error = " + str(WSSSE)) +{% endhighlight %} + +Similarly you can use RidgeRegressionWithSGD and LassoWithSGD and compare training Mean Squared +Errors. + +## Collaborative Filtering +In the following example we load rating data. Each row consists of a user, a product and a rating. +We use the default ALS.train() method which assumes ratings are explicit. We evaluate the +recommendation by measuring the Mean Squared Error of rating prediction. + +{% highlight python %} +from pyspark.mllib.recommendation import ALS +from numpy import array + +# Load and parse the data +data = sc.textFile("mllib/data/als/test.data") +ratings = data.map(lambda line: array([float(x) for x in line.split(',')])) + +# Build the recommendation model using Alternating Least Squares +model = ALS.train(sc, ratings, 1, 20) + +# Evaluate the model on training data +testdata = ratings.map(lambda p: (int(p[0]), int(p[1]))) +predictions = model.predictAll(testdata).map(lambda r: ((r[0], r[1]), r[2])) +ratesAndPreds = ratings.map(lambda r: ((r[0], r[1]), r[2])).join(predictions) +MSE = ratesAndPreds.map(lambda r: (r[1][0] - r[1][1])**2).reduce(lambda x, y: x + y)/ratesAndPreds.count() +print("Mean Squared Error = " + str(MSE)) +{% endhighlight %} + +If the rating matrix is derived from other source of information (i.e., it is inferred from other +signals), you can use the trainImplicit method to get better results. + +{% highlight python %} +# Build the recommendation model using Alternating Least Squares based on implicit ratings +model = ALS.trainImplicit(sc, ratings, 1, 20) +{% endhighlight %} diff --git a/docs/monitoring.md b/docs/monitoring.md index 5ed0474477..0d5eb7065e 100644 --- a/docs/monitoring.md +++ b/docs/monitoring.md @@ -32,7 +32,8 @@ Spark has a configurable metrics system based on the This allows users to report Spark metrics to a variety of sinks including HTTP, JMX, and CSV files. The metrics system is configured via a configuration file that Spark expects to be present at `$SPARK_HOME/conf/metrics.conf`. A custom file location can be specified via the -`spark.metrics.conf` Java system property. Spark's metrics are decoupled into different +`spark.metrics.conf` [configuration property](configuration.html#spark-properties). +Spark's metrics are decoupled into different _instances_ corresponding to Spark components. Within each instance, you can configure a set of sinks to which metrics are reported. The following instances are currently supported: diff --git a/docs/python-programming-guide.md b/docs/python-programming-guide.md index 55e39b1de1..dc187b3efe 100644 --- a/docs/python-programming-guide.md +++ b/docs/python-programming-guide.md @@ -47,7 +47,7 @@ PySpark will automatically ship these functions to workers, along with any objec Instances of classes will be serialized and shipped to workers by PySpark, but classes themselves cannot be automatically distributed to workers. The [Standalone Use](#standalone-use) section describes how to ship code dependencies to workers. -In addition, PySpark fully supports interactive use---simply run `./pyspark` to launch an interactive shell. +In addition, PySpark fully supports interactive use---simply run `./bin/pyspark` to launch an interactive shell. # Installing and Configuring PySpark @@ -60,17 +60,17 @@ By default, PySpark requires `python` to be available on the system `PATH` and u All of PySpark's library dependencies, including [Py4J](http://py4j.sourceforge.net/), are bundled with PySpark and automatically imported. -Standalone PySpark applications should be run using the `pyspark` script, which automatically configures the Java and Python environment using the settings in `conf/spark-env.sh` or `.cmd`. -The script automatically adds the `pyspark` package to the `PYTHONPATH`. +Standalone PySpark applications should be run using the `bin/pyspark` script, which automatically configures the Java and Python environment using the settings in `conf/spark-env.sh` or `.cmd`. +The script automatically adds the `bin/pyspark` package to the `PYTHONPATH`. # Interactive Use -The `pyspark` script launches a Python interpreter that is configured to run PySpark applications. To use `pyspark` interactively, first build Spark, then launch it directly from the command line without any options: +The `bin/pyspark` script launches a Python interpreter that is configured to run PySpark applications. To use `pyspark` interactively, first build Spark, then launch it directly from the command line without any options: {% highlight bash %} $ sbt/sbt assembly -$ ./pyspark +$ ./bin/pyspark {% endhighlight %} The Python shell can be used explore data interactively and is a simple way to learn the API: @@ -82,35 +82,35 @@ The Python shell can be used explore data interactively and is a simple way to l >>> help(pyspark) # Show all pyspark functions {% endhighlight %} -By default, the `pyspark` shell creates SparkContext that runs applications locally on a single core. +By default, the `bin/pyspark` shell creates SparkContext that runs applications locally on a single core. To connect to a non-local cluster, or use multiple cores, set the `MASTER` environment variable. -For example, to use the `pyspark` shell with a [standalone Spark cluster](spark-standalone.html): +For example, to use the `bin/pyspark` shell with a [standalone Spark cluster](spark-standalone.html): {% highlight bash %} -$ MASTER=spark://IP:PORT ./pyspark +$ MASTER=spark://IP:PORT ./bin/pyspark {% endhighlight %} Or, to use four cores on the local machine: {% highlight bash %} -$ MASTER=local[4] ./pyspark +$ MASTER=local[4] ./bin/pyspark {% endhighlight %} ## IPython It is also possible to launch PySpark in [IPython](http://ipython.org), the enhanced Python interpreter. -To do this, set the `IPYTHON` variable to `1` when running `pyspark`: +To do this, set the `IPYTHON` variable to `1` when running `bin/pyspark`: {% highlight bash %} -$ IPYTHON=1 ./pyspark +$ IPYTHON=1 ./bin/pyspark {% endhighlight %} Alternatively, you can customize the `ipython` command by setting `IPYTHON_OPTS`. For example, to launch the [IPython Notebook](http://ipython.org/notebook.html) with PyLab graphing support: {% highlight bash %} -$ IPYTHON_OPTS="notebook --pylab inline" ./pyspark +$ IPYTHON_OPTS="notebook --pylab inline" ./bin/pyspark {% endhighlight %} IPython also works on a cluster or on multiple cores if you set the `MASTER` environment variable. @@ -118,7 +118,7 @@ IPython also works on a cluster or on multiple cores if you set the `MASTER` env # Standalone Programs -PySpark can also be used from standalone Python scripts by creating a SparkContext in your script and running the script using `pyspark`. +PySpark can also be used from standalone Python scripts by creating a SparkContext in your script and running the script using `bin/pyspark`. The Quick Start guide includes a [complete example](quick-start.html#a-standalone-app-in-python) of a standalone Python application. Code dependencies can be deployed by listing them in the `pyFiles` option in the SparkContext constructor: @@ -131,15 +131,16 @@ sc = SparkContext("local", "App Name", pyFiles=['MyFile.py', 'lib.zip', 'app.egg Files listed here will be added to the `PYTHONPATH` and shipped to remote worker machines. Code dependencies can be added to an existing SparkContext using its `addPyFile()` method. -You can set [system properties](configuration.html#system-properties) -using `SparkContext.setSystemProperty()` class method *before* -instantiating SparkContext. For example, to set the amount of memory -per executor process: +You can set [configuration properties](configuration.html#spark-properties) by passing a +[SparkConf](api/pyspark/pyspark.conf.SparkConf-class.html) object to SparkContext: {% highlight python %} -from pyspark import SparkContext -SparkContext.setSystemProperty('spark.executor.memory', '2g') -sc = SparkContext("local", "App Name") +from pyspark import SparkConf, SparkContext +conf = (SparkConf() + .setMaster("local") + .setAppName("My app") + .set("spark.executor.memory", "1g")) +sc = SparkContext(conf = conf) {% endhighlight %} # API Docs @@ -152,6 +153,6 @@ Many of the methods also contain [doctests](http://docs.python.org/2/library/doc PySpark also includes several sample programs in the [`python/examples` folder](https://github.com/apache/incubator-spark/tree/master/python/examples). You can run them by passing the files to `pyspark`; e.g.: - ./pyspark python/examples/wordcount.py + ./bin/pyspark python/examples/wordcount.py Each program prints usage help when run without arguments. diff --git a/docs/quick-start.md b/docs/quick-start.md index 8f782db5b8..153081bdaa 100644 --- a/docs/quick-start.md +++ b/docs/quick-start.md @@ -20,7 +20,7 @@ $ sbt/sbt assembly ## Basics Spark's interactive shell provides a simple way to learn the API, as well as a powerful tool to analyze datasets interactively. -Start the shell by running `./spark-shell` in the Spark directory. +Start the shell by running `./bin/spark-shell` in the Spark directory. Spark's primary abstraction is a distributed collection of items called a Resilient Distributed Dataset (RDD). RDDs can be created from Hadoop InputFormats (such as HDFS files) or by transforming other RDDs. Let's make a new RDD from the text of the README file in the Spark source directory: @@ -99,7 +99,7 @@ scala> linesWithSpark.count() res9: Long = 15 {% endhighlight %} -It may seem silly to use Spark to explore and cache a 30-line text file. The interesting part is that these same functions can be used on very large data sets, even when they are striped across tens or hundreds of nodes. You can also do this interactively by connecting `spark-shell` to a cluster, as described in the [programming guide](scala-programming-guide.html#initializing-spark). +It may seem silly to use Spark to explore and cache a 30-line text file. The interesting part is that these same functions can be used on very large data sets, even when they are striped across tens or hundreds of nodes. You can also do this interactively by connecting `bin/spark-shell` to a cluster, as described in the [programming guide](scala-programming-guide.html#initializing-spark). # A Standalone App in Scala Now say we wanted to write a standalone application using the Spark API. We will walk through a simple application in both Scala (with SBT), Java (with Maven), and Python. If you are using other build systems, consider using the Spark assembly JAR described in the developer guide. @@ -124,7 +124,7 @@ object SimpleApp { } {% endhighlight %} -This program simply counts the number of lines containing 'a' and the number containing 'b' in the Spark README. Note that you'll need to replace $YOUR_SPARK_HOME with the location where Spark is installed. Unlike the earlier examples with the Spark shell, which initializes its own SparkContext, we initialize a SparkContext as part of the proogram. We pass the SparkContext constructor four arguments, the type of scheduler we want to use (in this case, a local scheduler), a name for the application, the directory where Spark is installed, and a name for the jar file containing the application's code. The final two arguments are needed in a distributed setting, where Spark is running across several nodes, so we include them for completeness. Spark will automatically ship the jar files you list to slave nodes. +This program just counts the number of lines containing 'a' and the number containing 'b' in the Spark README. Note that you'll need to replace $YOUR_SPARK_HOME with the location where Spark is installed. Unlike the earlier examples with the Spark shell, which initializes its own SparkContext, we initialize a SparkContext as part of the proogram. We pass the SparkContext constructor four arguments, the type of scheduler we want to use (in this case, a local scheduler), a name for the application, the directory where Spark is installed, and a name for the jar file containing the application's code. The final two arguments are needed in a distributed setting, where Spark is running across several nodes, so we include them for completeness. Spark will automatically ship the jar files you list to slave nodes. This file depends on the Spark API, so we'll also include an sbt configuration file, `simple.sbt` which explains that Spark is a dependency. This file also adds a repository that Spark depends on: @@ -146,7 +146,7 @@ If you also wish to read data from Hadoop's HDFS, you will also need to add a de libraryDependencies += "org.apache.hadoop" % "hadoop-client" % "<your-hdfs-version>" {% endhighlight %} -Finally, for sbt to work correctly, we'll need to layout `SimpleApp.scala` and `simple.sbt` according to the typical directory structure. Once that is in place, we can create a JAR package containing the application's code, then use `sbt run` to execute our program. +Finally, for sbt to work correctly, we'll need to layout `SimpleApp.scala` and `simple.sbt` according to the typical directory structure. Once that is in place, we can create a JAR package containing the application's code, then use `sbt/sbt run` to execute our program. {% highlight bash %} $ find . @@ -157,8 +157,8 @@ $ find . ./src/main/scala ./src/main/scala/SimpleApp.scala -$ sbt package -$ sbt run +$ sbt/sbt package +$ sbt/sbt run ... Lines with a: 46, Lines with b: 23 {% endhighlight %} @@ -193,7 +193,7 @@ public class SimpleApp { } {% endhighlight %} -This program simply counts the number of lines containing 'a' and the number containing 'b' in a system log file. Note that you'll need to replace $YOUR_SPARK_HOME with the location where Spark is installed. As with the Scala example, we initialize a SparkContext, though we use the special `JavaSparkContext` class to get a Java-friendly one. We also create RDDs (represented by `JavaRDD`) and run transformations on them. Finally, we pass functions to Spark by creating classes that extend `spark.api.java.function.Function`. The [Java programming guide](java-programming-guide.html) describes these differences in more detail. +This program just counts the number of lines containing 'a' and the number containing 'b' in a text file. Note that you'll need to replace $YOUR_SPARK_HOME with the location where Spark is installed. As with the Scala example, we initialize a SparkContext, though we use the special `JavaSparkContext` class to get a Java-friendly one. We also create RDDs (represented by `JavaRDD`) and run transformations on them. Finally, we pass functions to Spark by creating classes that extend `spark.api.java.function.Function`. The [Java programming guide](java-programming-guide.html) describes these differences in more detail. To build the program, we also write a Maven `pom.xml` file that lists Spark as a dependency. Note that Spark artifacts are tagged with a Scala version. @@ -224,11 +224,11 @@ To build the program, we also write a Maven `pom.xml` file that lists Spark as a If you also wish to read data from Hadoop's HDFS, you will also need to add a dependency on `hadoop-client` for your version of HDFS: {% highlight xml %} - <dependency> - <groupId>org.apache.hadoop</groupId> - <artifactId>hadoop-client</artifactId> - <version>...</version> - </dependency> +<dependency> + <groupId>org.apache.hadoop</groupId> + <artifactId>hadoop-client</artifactId> + <version>...</version> +</dependency> {% endhighlight %} We lay out these files according to the canonical Maven directory structure: @@ -270,18 +270,18 @@ print "Lines with a: %i, lines with b: %i" % (numAs, numBs) {% endhighlight %} -This program simply counts the number of lines containing 'a' and the number containing 'b' in a system log file. +This program just counts the number of lines containing 'a' and the number containing 'b' in a text file. Note that you'll need to replace $YOUR_SPARK_HOME with the location where Spark is installed. As with the Scala and Java examples, we use a SparkContext to create RDDs. We can pass Python functions to Spark, which are automatically serialized along with any variables that they reference. For applications that use custom classes or third-party libraries, we can add those code dependencies to SparkContext to ensure that they will be available on remote machines; this is described in more detail in the [Python programming guide](python-programming-guide.html). `SimpleApp` is simple enough that we do not need to specify any code dependencies. -We can run this application using the `pyspark` script: +We can run this application using the `bin/pyspark` script: {% highlight python %} $ cd $SPARK_HOME -$ ./pyspark SimpleApp.py +$ ./bin/pyspark SimpleApp.py ... Lines with a: 46, Lines with b: 23 {% endhighlight python %} @@ -301,14 +301,38 @@ assembly jar (or "uber" jar) containing your code and its dependencies. Both have assembly plugins. When creating assembly jars, list Spark itself as a `provided` dependency; it need not be bundled since it is already present on the slaves. Once you have an assembled jar, -add it to the SparkContext as shown here. It is also possible to submit -your dependent jars one-by-one when creating a SparkContext. +add it to the SparkContext as shown here. It is also possible to add +your dependent jars one-by-one using the `addJar` method of `SparkContext`. + +For Python, you can use the `pyFiles` argument of SparkContext +or its `addPyFile` method to add `.py`, `.zip` or `.egg` files to be distributed. ### Setting Configuration Options -Spark includes several configuration options which influence the behavior -of your application. These should be set as -[JVM system properties](configuration.html#system-properties) in your -program. The options will be captured and shipped to all slave nodes. +Spark includes several [configuration options](configuration.html#spark-properties) +that influence the behavior of your application. +These should be set by building a [SparkConf](api/core/index.html#org.apache.spark.SparkConf) +object and passing it to the SparkContext constructor. +For example, in Java and Scala, you can do: + +{% highlight scala %} +import org.apache.spark.{SparkConf, SparkContext} +val conf = new SparkConf() + .setMaster("local") + .setAppName("My application") + .set("spark.executor.memory", "1g") +val sc = new SparkContext(conf) +{% endhighlight %} + +Or in Python: + +{% highlight scala %} +from pyspark import SparkConf, SparkContext +conf = SparkConf() +conf.setMaster("local") +conf.setAppName("My application") +conf.set("spark.executor.memory", "1g")) +sc = SparkContext(conf = conf) +{% endhighlight %} ### Accessing Hadoop Filesystems diff --git a/docs/running-on-mesos.md b/docs/running-on-mesos.md index 322ff585f1..68259f0cb8 100644 --- a/docs/running-on-mesos.md +++ b/docs/running-on-mesos.md @@ -15,15 +15,16 @@ Spark can run on clusters managed by [Apache Mesos](http://mesos.apache.org/). F * `export MESOS_NATIVE_LIBRARY=<path to libmesos.so>`. This path is usually `<prefix>/lib/libmesos.so` (where the prefix is `/usr/local` by default, see above). Also, on Mac OS X, the library is called `libmesos.dylib` instead of `libmesos.so`. * `export SPARK_EXECUTOR_URI=<path to spark-{{site.SPARK_VERSION}}.tar.gz uploaded above>`. * `export MASTER=mesos://HOST:PORT` where HOST:PORT is the host and port (default: 5050) of your Mesos master (or `zk://...` if using Mesos with ZooKeeper). -8. To run a Spark application against the cluster, when you create your `SparkContext`, pass the string `mesos://HOST:PORT` as the first parameter. In addition, you'll need to set the `spark.executor.uri` property. For example: +8. To run a Spark application against the cluster, when you create your `SparkContext`, pass the string `mesos://HOST:PORT` as the master URL. In addition, you'll need to set the `spark.executor.uri` property. For example: {% highlight scala %} -System.setProperty("spark.executor.uri", "<path to spark-{{site.SPARK_VERSION}}.tar.gz uploaded above>") -val sc = new SparkContext("mesos://HOST:5050", "App Name", ...) +val conf = new SparkConf() + .setMaster("mesos://HOST:5050") + .setAppName("My app") + .set("spark.executor.uri", "<path to spark-{{site.SPARK_VERSION}}.tar.gz uploaded above>") +val sc = new SparkContext(conf) {% endhighlight %} -If you want to run Spark on Amazon EC2, you can use the Spark [EC2 launch scripts](ec2-scripts.html), which provide an easy way to launch a cluster with Mesos, Spark, and HDFS pre-configured. This will get you a cluster in about five minutes without any configuration on your part. - # Mesos Run Modes Spark can run over Mesos in two modes: "fine-grained" and "coarse-grained". In fine-grained mode, which is the default, @@ -34,17 +35,15 @@ launch only *one* long-running Spark task on each Mesos machine, and dynamically it. The benefit is much lower startup overhead, but at the cost of reserving the Mesos resources for the complete duration of the application. -To run in coarse-grained mode, set the `spark.mesos.coarse` system property to true *before* creating your SparkContext: +To run in coarse-grained mode, set the `spark.mesos.coarse` property in your [SparkConf](configuration.html#spark-properties): {% highlight scala %} -System.setProperty("spark.mesos.coarse", "true") -val sc = new SparkContext("mesos://HOST:5050", "App Name", ...) +conf.set("spark.mesos.coarse", "true") {% endhighlight %} In addition, for coarse-grained mode, you can control the maximum number of resources Spark will acquire. By default, it will acquire *all* cores in the cluster (that get offered by Mesos), which only makes sense if you run just one -application at a time. You can cap the maximum number of cores using `System.setProperty("spark.cores.max", "10")` (for example). -Again, this must be done *before* initializing a SparkContext. +application at a time. You can cap the maximum number of cores using `conf.set("spark.cores.max", "10")` (for example). # Running Alongside Hadoop diff --git a/docs/running-on-yarn.md b/docs/running-on-yarn.md index 4056e9c15d..b206270107 100644 --- a/docs/running-on-yarn.md +++ b/docs/running-on-yarn.md @@ -12,11 +12,12 @@ was added to Spark in version 0.6.0, and improved in 0.7.0 and 0.8.0. We need a consolidated Spark JAR (which bundles all the required dependencies) to run Spark jobs on a YARN cluster. This can be built by setting the Hadoop version and `SPARK_YARN` environment variable, as follows: - SPARK_HADOOP_VERSION=2.0.5-alpha SPARK_YARN=true ./sbt/sbt assembly + SPARK_HADOOP_VERSION=2.0.5-alpha SPARK_YARN=true sbt/sbt assembly The assembled JAR will be something like this: `./assembly/target/scala-{{site.SCALA_VERSION}}/spark-assembly_{{site.SPARK_VERSION}}-hadoop2.0.5.jar`. +The build process now also supports new YARN versions (2.2.x). See below. # Preparations @@ -31,27 +32,34 @@ If you want to test out the YARN deployment mode, you can use the current Spark Most of the configs are the same for Spark on YARN as other deploys. See the Configuration page for more information on those. These are configs that are specific to SPARK on YARN. Environment variables: + * `SPARK_YARN_USER_ENV`, to add environment variables to the Spark processes launched on YARN. This can be a comma separated list of environment variables, e.g. `SPARK_YARN_USER_ENV="JAVA_HOME=/jdk64,FOO=bar"`. System Properties: -* 'spark.yarn.applicationMaster.waitTries', property to set the number of times the ApplicationMaster waits for the the spark master and then also the number of tries it waits for the Spark Context to be intialized. Default is 10. -* 'spark.yarn.submit.file.replication', the HDFS replication level for the files uploaded into HDFS for the application. These include things like the spark jar, the app jar, and any distributed cache files/archives. -* 'spark.yarn.preserve.staging.files', set to true to preserve the staged files(spark jar, app jar, distributed cache files) at the end of the job rather then delete them. -* 'spark.yarn.scheduler.heartbeat.interval-ms', the interval in ms in which the Spark application master heartbeats into the YARN ResourceManager. Default is 5 seconds. -* 'spark.yarn.max.worker.failures', the maximum number of worker failures before failing the application. Default is the number of workers requested times 2 with minimum of 3. + +* `spark.yarn.applicationMaster.waitTries`, property to set the number of times the ApplicationMaster waits for the the spark master and then also the number of tries it waits for the Spark Context to be intialized. Default is 10. +* `spark.yarn.submit.file.replication`, the HDFS replication level for the files uploaded into HDFS for the application. These include things like the spark jar, the app jar, and any distributed cache files/archives. +* `spark.yarn.preserve.staging.files`, set to true to preserve the staged files(spark jar, app jar, distributed cache files) at the end of the job rather then delete them. +* `spark.yarn.scheduler.heartbeat.interval-ms`, the interval in ms in which the Spark application master heartbeats into the YARN ResourceManager. Default is 5 seconds. +* `spark.yarn.max.worker.failures`, the maximum number of worker failures before failing the application. Default is the number of workers requested times 2 with minimum of 3. # Launching Spark on YARN Ensure that HADOOP_CONF_DIR or YARN_CONF_DIR points to the directory which contains the (client side) configuration files for the hadoop cluster. This would be used to connect to the cluster, write to the dfs and submit jobs to the resource manager. +There are two scheduler mode that can be used to launch spark application on YARN. + +## Launch spark application by YARN Client with yarn-standalone mode. + The command to launch the YARN Client is as follows: - SPARK_JAR=<SPARK_ASSEMBLY_JAR_FILE> ./spark-class org.apache.spark.deploy.yarn.Client \ + SPARK_JAR=<SPARK_ASSEMBLY_JAR_FILE> ./bin/spark-class org.apache.spark.deploy.yarn.Client \ --jar <YOUR_APP_JAR_FILE> \ --class <APP_MAIN_CLASS> \ --args <APP_MAIN_ARGUMENTS> \ --num-workers <NUMBER_OF_WORKER_MACHINES> \ + --master-class <ApplicationMaster_CLASS> --master-memory <MEMORY_FOR_MASTER> \ --worker-memory <MEMORY_PER_WORKER> \ --worker-cores <CORES_PER_WORKER> \ @@ -64,14 +72,14 @@ The command to launch the YARN Client is as follows: For example: # Build the Spark assembly JAR and the Spark examples JAR - $ SPARK_HADOOP_VERSION=2.0.5-alpha SPARK_YARN=true ./sbt/sbt assembly + $ SPARK_HADOOP_VERSION=2.0.5-alpha SPARK_YARN=true sbt/sbt assembly # Configure logging $ cp conf/log4j.properties.template conf/log4j.properties # Submit Spark's ApplicationMaster to YARN's ResourceManager, and instruct Spark to run the SparkPi example $ SPARK_JAR=./assembly/target/scala-{{site.SCALA_VERSION}}/spark-assembly-{{site.SPARK_VERSION}}-hadoop2.0.5-alpha.jar \ - ./spark-class org.apache.spark.deploy.yarn.Client \ + ./bin/spark-class org.apache.spark.deploy.yarn.Client \ --jar examples/target/scala-{{site.SCALA_VERSION}}/spark-examples-assembly-{{site.SPARK_VERSION}}.jar \ --class org.apache.spark.examples.SparkPi \ --args yarn-standalone \ @@ -85,11 +93,35 @@ For example: $ cat $YARN_APP_LOGS_DIR/$YARN_APP_ID/container*_000001/stdout Pi is roughly 3.13794 -The above starts a YARN Client programs which periodically polls the Application Master for status updates and displays them in the console. The client will exit once your application has finished running. +The above starts a YARN Client programs which start the default Application Master. Then SparkPi will be run as a child thread of Application Master, YARN Client will periodically polls the Application Master for status updates and displays them in the console. The client will exit once your application has finished running. + +With this mode, your application is actually run on the remote machine where the Application Master is run upon. Thus application that involve local interaction will not work well, e.g. spark-shell. + +## Launch spark application with yarn-client mode. + +With yarn-client mode, the application will be launched locally. Just like running application or spark-shell on Local / Mesos / Standalone mode. The launch method is also the similar with them, just make sure that when you need to specify a master url, use "yarn-client" instead. And you also need to export the env value for SPARK_JAR and SPARK_YARN_APP_JAR + +In order to tune worker core/number/memory etc. You need to export SPARK_WORKER_CORES, SPARK_WORKER_MEMORY, SPARK_WORKER_INSTANCES e.g. by ./conf/spark-env.sh + +For example: + + SPARK_JAR=./assembly/target/scala-{{site.SCALA_VERSION}}/spark-assembly-{{site.SPARK_VERSION}}-hadoop2.0.5-alpha.jar \ + SPARK_YARN_APP_JAR=examples/target/scala-{{site.SCALA_VERSION}}/spark-examples-assembly-{{site.SPARK_VERSION}}.jar \ + ./bin/run-example org.apache.spark.examples.SparkPi yarn-client + + + SPARK_JAR=./assembly/target/scala-{{site.SCALA_VERSION}}/spark-assembly-{{site.SPARK_VERSION}}-hadoop2.0.5-alpha.jar \ + SPARK_YARN_APP_JAR=examples/target/scala-{{site.SCALA_VERSION}}/spark-examples-assembly-{{site.SPARK_VERSION}}.jar \ + MASTER=yarn-client ./bin/spark-shell + +You can also send extra files to yarn cluster for worker to use by exporting SPARK_YARN_DIST_FILES=file1,file2... etc. + +# Building Spark for Hadoop/YARN 2.2.x + +See [Building Spark with Maven](building-with-maven.html) for instructions on how to build Spark using the Maven process. # Important Notes -- When your application instantiates a Spark context it must use a special "yarn-standalone" master url. This starts the scheduler without forcing it to connect to a cluster. A good way to handle this is to pass "yarn-standalone" as an argument to your program, as shown in the example above. - We do not requesting container resources based on the number of cores. Thus the numbers of cores given via command line arguments cannot be guaranteed. - The local directories used for spark will be the local directories configured for YARN (Hadoop Yarn config yarn.nodemanager.local-dirs). If the user specifies spark.local.dir, it will be ignored. - The --files and --archives options support specifying file names with the # similar to Hadoop. For example you can specify: --files localtest.txt#appSees.txt and this will upload the file you have locally named localtest.txt into HDFS but this will be linked to by the name appSees.txt and your application should use the name as appSees.txt to reference it when running on YARN. diff --git a/docs/scala-programming-guide.md b/docs/scala-programming-guide.md index 94e8563a8b..c1ef46a1cd 100644 --- a/docs/scala-programming-guide.md +++ b/docs/scala-programming-guide.md @@ -13,7 +13,7 @@ At a high level, every Spark application consists of a *driver program* that run A second abstraction in Spark is *shared variables* that can be used in parallel operations. By default, when Spark runs a function in parallel as a set of tasks on different nodes, it ships a copy of each variable used in the function to each task. Sometimes, a variable needs to be shared across tasks, or between tasks and the driver program. Spark supports two types of shared variables: *broadcast variables*, which can be used to cache a value in memory on all nodes, and *accumulators*, which are variables that are only "added" to, such as counters and sums. -This guide shows each of these features and walks through some samples. It assumes some familiarity with Scala, especially with the syntax for [closures](http://www.scala-lang.org/node/133). Note that you can also run Spark interactively using the `spark-shell` script. We highly recommend doing that to follow along! +This guide shows each of these features and walks through some samples. It assumes some familiarity with Scala, especially with the syntax for [closures](http://www.scala-lang.org/node/133). Note that you can also run Spark interactively using the `bin/spark-shell` script. We highly recommend doing that to follow along! # Linking with Spark @@ -49,18 +49,21 @@ This is done through the following constructor: new SparkContext(master, appName, [sparkHome], [jars]) {% endhighlight %} +or through `new SparkContext(conf)`, which takes a [SparkConf](api/core/index.html#org.apache.spark.SparkConf) +object for more advanced configuration. + The `master` parameter is a string specifying a [Spark or Mesos cluster URL](#master-urls) to connect to, or a special "local" string to run in local mode, as described below. `appName` is a name for your application, which will be shown in the cluster web UI. Finally, the last two parameters are needed to deploy your code to a cluster if running in distributed mode, as described later. -In the Spark shell, a special interpreter-aware SparkContext is already created for you, in the variable called `sc`. Making your own SparkContext will not work. You can set which master the context connects to using the `MASTER` environment variable, and you can add JARs to the classpath with the `ADD_JARS` variable. For example, to run `spark-shell` on four cores, use +In the Spark shell, a special interpreter-aware SparkContext is already created for you, in the variable called `sc`. Making your own SparkContext will not work. You can set which master the context connects to using the `MASTER` environment variable, and you can add JARs to the classpath with the `ADD_JARS` variable. For example, to run `bin/spark-shell` on four cores, use {% highlight bash %} -$ MASTER=local[4] ./spark-shell +$ MASTER=local[4] ./bin/spark-shell {% endhighlight %} Or, to also add `code.jar` to its classpath, use: {% highlight bash %} -$ MASTER=local[4] ADD_JARS=code.jar ./spark-shell +$ MASTER=local[4] ADD_JARS=code.jar ./bin/spark-shell {% endhighlight %} ### Master URLs @@ -92,8 +95,7 @@ If you want to run your application on a cluster, you will need to specify the t * `sparkHome`: The path at which Spark is installed on your worker machines (it should be the same on all of them). * `jars`: A list of JAR files on the local machine containing your application's code and any dependencies, which Spark will deploy to all the worker nodes. You'll need to package your application into a set of JARs using your build system. For example, if you're using SBT, the [sbt-assembly](https://github.com/sbt/sbt-assembly) plugin is a good way to make a single JAR with your code and dependencies. -If you run `spark-shell` on a cluster, you can add JARs to it by specifying the `ADD_JARS` environment variable before you launch it. This variable should contain a comma-separated list of JARs. For example, `ADD_JARS=a.jar,b.jar ./spark-shell` will launch a shell with `a.jar` and `b.jar` on its classpath. In addition, any new classes you define in the shell will automatically be distributed. - +If you run `bin/spark-shell` on a cluster, you can add JARs to it by specifying the `ADD_JARS` environment variable before you launch it. This variable should contain a comma-separated list of JARs. For example, `ADD_JARS=a.jar,b.jar ./bin/spark-shell` will launch a shell with `a.jar` and `b.jar` on its classpath. In addition, any new classes you define in the shell will automatically be distributed. # Resilient Distributed Datasets (RDDs) @@ -363,10 +365,10 @@ res2: Int = 10 # Where to Go from Here -You can see some [example Spark programs](http://www.spark-project.org/examples.html) on the Spark website. -In addition, Spark includes several samples in `examples/src/main/scala`. Some of them have both Spark versions and local (non-parallel) versions, allowing you to see what had to be changed to make the program run on a cluster. You can run them using by passing the class name to the `run-example` script included in Spark; for example: +You can see some [example Spark programs](http://spark.incubator.apache.org/examples.html) on the Spark website. +In addition, Spark includes several samples in `examples/src/main/scala`. Some of them have both Spark versions and local (non-parallel) versions, allowing you to see what had to be changed to make the program run on a cluster. You can run them using by passing the class name to the `bin/run-example` script included in Spark; for example: - ./run-example org.apache.spark.examples.SparkPi + ./bin/run-example org.apache.spark.examples.SparkPi Each example program prints usage help when run without any arguments. diff --git a/docs/spark-debugger.md b/docs/spark-debugger.md index d6315d97f4..11c51d5cde 100644 --- a/docs/spark-debugger.md +++ b/docs/spark-debugger.md @@ -39,7 +39,7 @@ where `path/to/event-log` is where you want the event log to go relative to `$SP ### Loading the event log into the debugger -1. Run a Spark shell with `MASTER=<i>host</i> ./spark-shell`. +1. Run a Spark shell with `MASTER=<i>host</i> ./bin/spark-shell`. 2. Use `EventLogReader` to load the event log as follows: {% highlight scala %} spark> val r = new spark.EventLogReader(sc, Some("path/to/event-log")) diff --git a/docs/spark-standalone.md b/docs/spark-standalone.md index 17066ef0dd..f47d41f966 100644 --- a/docs/spark-standalone.md +++ b/docs/spark-standalone.md @@ -20,7 +20,7 @@ then modify `conf/spark-env.sh` in the `dist/` directory before deploying to all You can start a standalone master server by executing: - ./bin/start-master.sh + ./sbin/start-master.sh Once started, the master will print out a `spark://HOST:PORT` URL for itself, which you can use to connect workers to it, or pass as the "master" argument to `SparkContext`. You can also find this URL on @@ -28,7 +28,7 @@ the master's web UI, which is [http://localhost:8080](http://localhost:8080) by Similarly, you can start one or more workers and connect them to the master via: - ./spark-class org.apache.spark.deploy.worker.Worker spark://IP:PORT + ./bin/spark-class org.apache.spark.deploy.worker.Worker spark://IP:PORT Once you have started a worker, look at the master's web UI ([http://localhost:8080](http://localhost:8080) by default). You should see the new node listed there, along with its number of CPUs and memory (minus one gigabyte left for the OS). @@ -51,11 +51,11 @@ Finally, the following configuration options can be passed to the master and wor </tr> <tr> <td><code>-c CORES</code>, <code>--cores CORES</code></td> - <td>Total CPU cores to allow Spark applicatons to use on the machine (default: all available); only on worker</td> + <td>Total CPU cores to allow Spark applications to use on the machine (default: all available); only on worker</td> </tr> <tr> <td><code>-m MEM</code>, <code>--memory MEM</code></td> - <td>Total amount of memory to allow Spark applicatons to use on the machine, in a format like 1000M or 2G (default: your machine's total RAM minus 1 GB); only on worker</td> + <td>Total amount of memory to allow Spark applications to use on the machine, in a format like 1000M or 2G (default: your machine's total RAM minus 1 GB); only on worker</td> </tr> <tr> <td><code>-d DIR</code>, <code>--work-dir DIR</code></td> @@ -70,12 +70,12 @@ To launch a Spark standalone cluster with the launch scripts, you need to create Once you've set up this file, you can launch or stop your cluster with the following shell scripts, based on Hadoop's deploy scripts, and available in `SPARK_HOME/bin`: -- `bin/start-master.sh` - Starts a master instance on the machine the script is executed on. -- `bin/start-slaves.sh` - Starts a slave instance on each machine specified in the `conf/slaves` file. -- `bin/start-all.sh` - Starts both a master and a number of slaves as described above. -- `bin/stop-master.sh` - Stops the master that was started via the `bin/start-master.sh` script. -- `bin/stop-slaves.sh` - Stops the slave instances that were started via `bin/start-slaves.sh`. -- `bin/stop-all.sh` - Stops both the master and the slaves as described above. +- `sbin/start-master.sh` - Starts a master instance on the machine the script is executed on. +- `sbin/start-slaves.sh` - Starts a slave instance on each machine specified in the `conf/slaves` file. +- `sbin/start-all.sh` - Starts both a master and a number of slaves as described above. +- `sbin/stop-master.sh` - Stops the master that was started via the `bin/start-master.sh` script. +- `sbin/stop-slaves.sh` - Stops the slave instances that were started via `bin/start-slaves.sh`. +- `sbin/stop-all.sh` - Stops both the master and the slaves as described above. Note that these scripts must be executed on the machine you want to run the Spark master on, not your local machine. @@ -143,9 +143,9 @@ constructor](scala-programming-guide.html#initializing-spark). To run an interactive Spark shell against the cluster, run the following command: - MASTER=spark://IP:PORT ./spark-shell + MASTER=spark://IP:PORT ./bin/spark-shell -Note that if you are running spark-shell from one of the spark cluster machines, the `spark-shell` script will +Note that if you are running spark-shell from one of the spark cluster machines, the `bin/spark-shell` script will automatically set MASTER from the `SPARK_MASTER_IP` and `SPARK_MASTER_PORT` variables in `conf/spark-env.sh`. You can also pass an option `-c <numCores>` to control the number of cores that spark-shell uses on the cluster. @@ -154,12 +154,29 @@ You can also pass an option `-c <numCores>` to control the number of cores that The standalone cluster mode currently only supports a simple FIFO scheduler across applications. However, to allow multiple concurrent users, you can control the maximum number of resources each -application will acquire. +application will use. By default, it will acquire *all* cores in the cluster, which only makes sense if you just run one -application at a time. You can cap the number of cores using -`System.setProperty("spark.cores.max", "10")` (for example). -This value must be set *before* initializing your SparkContext. - +application at a time. You can cap the number of cores by setting `spark.cores.max` in your +[SparkConf](configuration.html#spark-properties). For example: + +{% highlight scala %} +val conf = new SparkConf() + .setMaster(...) + .setAppName(...) + .set("spark.cores.max", "10") +val sc = new SparkContext(conf) +{% endhighlight %} + +In addition, you can configure `spark.deploy.defaultCores` on the cluster master process to change the +default for applications that don't set `spark.cores.max` to something less than infinite. +Do this by adding the following to `conf/spark-env.sh`: + +{% highlight bash %} +export SPARK_JAVA_OPTS="-Dspark.deploy.defaultCores=<value>" +{% endhighlight %} + +This is useful on shared clusters where users might not have configured a maximum number of cores +individually. # Monitoring and Logging diff --git a/docs/streaming-programming-guide.md b/docs/streaming-programming-guide.md index 851e30fe76..1c9ece6270 100644 --- a/docs/streaming-programming-guide.md +++ b/docs/streaming-programming-guide.md @@ -214,7 +214,7 @@ ssc.stop() {% endhighlight %} # Example -A simple example to start off is the [NetworkWordCount](https://github.com/apache/incubator-spark/tree/master/examples/src/main/scala/spark/streaming/examples/NetworkWordCount.scala). This example counts the words received from a network server every second. Given below is the relevant sections of the source code. You can find the full source code in `<Spark repo>/streaming/src/main/scala/spark/streaming/examples/NetworkWordCount.scala` . +A simple example to start off is the [NetworkWordCount](https://github.com/apache/incubator-spark/tree/master/examples/src/main/scala/org/apache/spark/streaming/examples/NetworkWordCount.scala). This example counts the words received from a network server every second. Given below is the relevant sections of the source code. You can find the full source code in `<Spark repo>/streaming/src/main/scala/org/apache/spark/streaming/examples/NetworkWordCount.scala` . {% highlight scala %} import org.apache.spark.streaming.{Seconds, StreamingContext} @@ -245,7 +245,7 @@ $ nc -lk 9999 Then, in a different terminal, you can start NetworkWordCount by using {% highlight bash %} -$ ./run-example org.apache.spark.streaming.examples.NetworkWordCount local[2] localhost 9999 +$ ./bin/run-example org.apache.spark.streaming.examples.NetworkWordCount local[2] localhost 9999 {% endhighlight %} This will make NetworkWordCount connect to the netcat server. Any lines typed in the terminal running the netcat server will be counted and printed on screen. @@ -283,7 +283,7 @@ Time: 1357008430000 ms </td> </table> -You can find more examples in `<Spark repo>/streaming/src/main/scala/spark/streaming/examples/`. They can be run in the similar manner using `./run-example org.apache.spark.streaming.examples....` . Executing without any parameter would give the required parameter list. Further explanation to run them can be found in comments in the files. +You can find more examples in `<Spark repo>/streaming/src/main/scala/org/apache/spark/streaming/examples/`. They can be run in the similar manner using `./bin/run-example org.apache.spark.streaming.examples....` . Executing without any parameter would give the required parameter list. Further explanation to run them can be found in comments in the files. # DStream Persistence Similar to RDDs, DStreams also allow developers to persist the stream's data in memory. That is, using `persist()` method on a DStream would automatically persist every RDD of that DStream in memory. This is useful if the data in the DStream will be computed multiple times (e.g., multiple operations on the same data). For window-based operations like `reduceByWindow` and `reduceByKeyAndWindow` and state-based operations like `updateStateByKey`, this is implicitly true. Hence, DStreams generated by window-based operations are automatically persisted in memory, without the developer calling `persist()`. @@ -326,7 +326,7 @@ Getting the best performance of a Spark Streaming application on a cluster requi There are a number of optimizations that can be done in Spark to minimize the processing time of each batch. These have been discussed in detail in [Tuning Guide](tuning.html). This section highlights some of the most important ones. ### Level of Parallelism -Cluster resources maybe under-utilized if the number of parallel tasks used in any stage of the computation is not high enough. For example, for distributed reduce operations like `reduceByKey` and `reduceByKeyAndWindow`, the default number of parallel tasks is 8. You can pass the level of parallelism as an argument (see the [`PairDStreamFunctions`](api/streaming/index.html#org.apache.spark.PairDStreamFunctions) documentation), or set the system property `spark.default.parallelism` to change the default. +Cluster resources maybe under-utilized if the number of parallel tasks used in any stage of the computation is not high enough. For example, for distributed reduce operations like `reduceByKey` and `reduceByKeyAndWindow`, the default number of parallel tasks is 8. You can pass the level of parallelism as an argument (see the [`PairDStreamFunctions`](api/streaming/index.html#org.apache.spark.PairDStreamFunctions) documentation), or set the [config property](configuration.html#spark-properties) `spark.default.parallelism` to change the default. ### Data Serialization The overhead of data serialization can be significant, especially when sub-second batch sizes are to be achieved. There are two aspects to it. @@ -349,7 +349,7 @@ For a Spark Streaming application running on a cluster to be stable, the process A good approach to figure out the right batch size for your application is to test it with a conservative batch size (say, 5-10 seconds) and a low data rate. To verify whether the system is able to keep up with data rate, you can check the value of the end-to-end delay experienced by each processed batch (in the Spark master logs, find the line having the phrase "Total delay"). If the delay is maintained to be less than the batch size, then system is stable. Otherwise, if the delay is continuously increasing, it means that the system is unable to keep up and it therefore unstable. Once you have an idea of a stable configuration, you can try increasing the data rate and/or reducing the batch size. Note that momentary increase in the delay due to temporary data rate increases maybe fine as long as the delay reduces back to a low value (i.e., less than batch size). ## 24/7 Operation -By default, Spark does not forget any of the metadata (RDDs generated, stages processed, etc.). But for a Spark Streaming application to operate 24/7, it is necessary for Spark to do periodic cleanup of it metadata. This can be enabled by setting the Java system property `spark.cleaner.ttl` to the number of seconds you want any metadata to persist. For example, setting `spark.cleaner.ttl` to 600 would cause Spark periodically cleanup all metadata and persisted RDDs that are older than 10 minutes. Note, that this property needs to be set before the SparkContext is created. +By default, Spark does not forget any of the metadata (RDDs generated, stages processed, etc.). But for a Spark Streaming application to operate 24/7, it is necessary for Spark to do periodic cleanup of it metadata. This can be enabled by setting the [config property](configuration.html#spark-properties) `spark.cleaner.ttl` to the number of seconds you want any metadata to persist. For example, setting `spark.cleaner.ttl` to 600 would cause Spark periodically cleanup all metadata and persisted RDDs that are older than 10 minutes. Note, that this property needs to be set before the SparkContext is created. This value is closely tied with any window operation that is being used. Any window operation would require the input data to be persisted in memory for at least the duration of the window. Hence it is necessary to set the delay to at least the value of the largest window operation used in the Spark Streaming application. If this delay is set too low, the application will throw an exception saying so. @@ -483,7 +483,7 @@ Similar to [Spark's Java API](java-programming-guide.html), we also provide a Ja 1. Functions for transformations must be implemented as subclasses of [Function](api/core/index.html#org.apache.spark.api.java.function.Function) and [Function2](api/core/index.html#org.apache.spark.api.java.function.Function2) 1. Unlike the Scala API, the Java API handles DStreams for key-value pairs using a separate [JavaPairDStream](api/streaming/index.html#org.apache.spark.streaming.api.java.JavaPairDStream) class(similar to [JavaRDD and JavaPairRDD](java-programming-guide.html#rdd-classes). DStream functions like `map` and `filter` are implemented separately by JavaDStreams and JavaPairDStream to return DStreams of appropriate types. -Spark's [Java Programming Guide](java-programming-guide.html) gives more ideas about using the Java API. To extends the ideas presented for the RDDs to DStreams, we present parts of the Java version of the same NetworkWordCount example presented above. The full source code is given at `<spark repo>/examples/src/main/java/spark/streaming/examples/JavaNetworkWordCount.java` +Spark's [Java Programming Guide](java-programming-guide.html) gives more ideas about using the Java API. To extends the ideas presented for the RDDs to DStreams, we present parts of the Java version of the same NetworkWordCount example presented above. The full source code is given at `<spark repo>/examples/src/main/java/org/apache/spark/streaming/examples/JavaNetworkWordCount.java` The streaming context and the socket stream from input source is started by using a `JavaStreamingContext`, that has the same parameters and provides the same input streams as its Scala counterpart. @@ -527,5 +527,5 @@ JavaPairDStream<String, Integer> wordCounts = words.map( # Where to Go from Here * API docs - [Scala](api/streaming/index.html#org.apache.spark.streaming.package) and [Java](api/streaming/index.html#org.apache.spark.streaming.api.java.package) -* More examples - [Scala](https://github.com/apache/incubator-spark/tree/master/examples/src/main/scala/spark/streaming/examples) and [Java](https://github.com/apache/incubator-spark/tree/master/examples/src/main/java/spark/streaming/examples) +* More examples - [Scala](https://github.com/apache/incubator-spark/tree/master/examples/src/main/scala/org/apache/spark/streaming/examples) and [Java](https://github.com/apache/incubator-spark/tree/master/examples/src/main/java/org/apache/spark/streaming/examples) * [Paper describing Spark Streaming](http://www.eecs.berkeley.edu/Pubs/TechRpts/2012/EECS-2012-259.pdf) diff --git a/docs/tuning.md b/docs/tuning.md index f33fda37eb..bbb870085c 100644 --- a/docs/tuning.md +++ b/docs/tuning.md @@ -38,13 +38,15 @@ in your operations) and performance. It provides two serialization libraries: `Serializable` types and requires you to *register* the classes you'll use in the program in advance for best performance. -You can switch to using Kryo by calling `System.setProperty("spark.serializer", "org.apache.spark.serializer.KryoSerializer")` -*before* creating your SparkContext. The only reason it is not the default is because of the custom +You can switch to using Kryo by initializing your job with a [SparkConf](configuration.html#spark-properties) +and calling `conf.set("spark.serializer", "org.apache.spark.serializer.KryoSerializer")`. +This setting configures the serializer used for not only shuffling data between worker +nodes but also when serializing RDDs to disk. The only reason Kryo is not the default is because of the custom registration requirement, but we recommend trying it in any network-intensive application. Finally, to register your classes with Kryo, create a public class that extends [`org.apache.spark.serializer.KryoRegistrator`](api/core/index.html#org.apache.spark.serializer.KryoRegistrator) and set the -`spark.kryo.registrator` system property to point to it, as follows: +`spark.kryo.registrator` config property to point to it, as follows: {% highlight scala %} import com.esotericsoftware.kryo.Kryo @@ -57,17 +59,17 @@ class MyRegistrator extends KryoRegistrator { } } -// Make sure to set these properties *before* creating a SparkContext! -System.setProperty("spark.serializer", "org.apache.spark.serializer.KryoSerializer") -System.setProperty("spark.kryo.registrator", "mypackage.MyRegistrator") -val sc = new SparkContext(...) +val conf = new SparkConf().setMaster(...).setAppName(...) +conf.set("spark.serializer", "org.apache.spark.serializer.KryoSerializer") +conf.set("spark.kryo.registrator", "mypackage.MyRegistrator") +val sc = new SparkContext(conf) {% endhighlight %} The [Kryo documentation](http://code.google.com/p/kryo/) describes more advanced registration options, such as adding custom serialization code. If your objects are large, you may also need to increase the `spark.kryoserializer.buffer.mb` -system property. The default is 2, but this value needs to be large enough to hold the *largest* +config property. The default is 2, but this value needs to be large enough to hold the *largest* object you will serialize. Finally, if you don't register your classes, Kryo will still work, but it will have to store the @@ -164,7 +166,7 @@ cache RDDs. This means that 33% of memory is available for any objects created d In case your tasks slow down and you find that your JVM is garbage-collecting frequently or running out of memory, lowering this value will help reduce the memory consumption. To change this to say 50%, you can call -`System.setProperty("spark.storage.memoryFraction", "0.5")`. Combined with the use of serialized caching, +`conf.set("spark.storage.memoryFraction", "0.5")` on your SparkConf. Combined with the use of serialized caching, using a smaller cache should be sufficient to mitigate most of the garbage collection problems. In case you are interested in further tuning the Java GC, continue reading below. @@ -218,7 +220,7 @@ enough. Spark automatically sets the number of "map" tasks to run on each file a distributed "reduce" operations, such as `groupByKey` and `reduceByKey`, it uses the largest parent RDD's number of partitions. You can pass the level of parallelism as a second argument (see the [`spark.PairRDDFunctions`](api/core/index.html#org.apache.spark.rdd.PairRDDFunctions) documentation), -or set the system property `spark.default.parallelism` to change the default. +or set the config property `spark.default.parallelism` to change the default. In general, we recommend 2-3 tasks per CPU core in your cluster. ## Memory Usage of Reduce Tasks |