[SPARK-13874][DOC] Remove docs of streaming-akka, streaming-zeromq, streaming-mqtt and streaming-twitter

## What changes were proposed in this pull request?

This PR removes all docs about the old streaming-akka, streaming-zeromq, streaming-mqtt and streaming-twitter projects since I have already copied them to https://github.com/spark-packages

Also remove mqtt_wordcount.py that I forgot to remove previously.

## How was this patch tested?

Jenkins PR Build.

Author: Shixiong Zhu <shixiong@databricks.com>

Closes #11824 from zsxwing/remove-doc.

6 files changed, 14 insertions, 158 deletions

diff --git a/NOTICE b/NOTICE
index 6a26155fb4..2a6fe237dc 100644
--- a/NOTICE
+++ b/NOTICE
@@ -48,7 +48,6 @@ Eclipse Public License 1.0
 
 The following components are provided under the Eclipse Public License 1.0. See project link for details.
 
-     (Eclipse Public License - Version 1.0) mqtt-client (org.eclipse.paho:mqtt-client:0.4.0 - http://www.eclipse.org/paho/mqtt-client)
      (Eclipse Public License v1.0) Eclipse JDT Core (org.eclipse.jdt:core:3.1.1 - http://www.eclipse.org/jdt/)
 
 ========================================================================
diff --git a/docs/streaming-programming-guide.md b/docs/streaming-programming-guide.md
index 6c36b41e78..8d21917a7d 100644
--- a/docs/streaming-programming-guide.md
+++ b/docs/streaming-programming-guide.md
@@ -11,7 +11,7 @@ description: Spark Streaming programming guide and tutorial for Spark SPARK_VERS
 # Overview
 Spark Streaming is an extension of the core Spark API that enables scalable, high-throughput,
 fault-tolerant stream processing of live data streams. Data can be ingested from many sources
-like Kafka, Flume, Twitter, ZeroMQ, Kinesis, or TCP sockets, and can be processed using complex
+like Kafka, Flume, Kinesis, or TCP sockets, and can be processed using complex
 algorithms expressed with high-level functions like `map`, `reduce`, `join` and `window`.
 Finally, processed data can be pushed out to filesystems, databases,
 and live dashboards. In fact, you can apply Spark's
@@ -419,9 +419,6 @@ some of the common ones are as follows.
 <tr><td> Kafka </td><td> spark-streaming-kafka_{{site.SCALA_BINARY_VERSION}} </td></tr>
 <tr><td> Flume </td><td> spark-streaming-flume_{{site.SCALA_BINARY_VERSION}} </td></tr>
 <tr><td> Kinesis<br/></td><td>spark-streaming-kinesis-asl_{{site.SCALA_BINARY_VERSION}} [Amazon Software License] </td></tr>
-<tr><td> Twitter </td><td> spark-streaming-twitter_{{site.SCALA_BINARY_VERSION}} </td></tr>
-<tr><td> ZeroMQ </td><td> spark-streaming-zeromq_{{site.SCALA_BINARY_VERSION}} </td></tr>
-<tr><td> MQTT </td><td> spark-streaming-mqtt_{{site.SCALA_BINARY_VERSION}} </td></tr>
 <tr><td></td><td></td></tr>
 </table>
 
@@ -595,7 +592,7 @@ Spark Streaming provides two categories of built-in streaming sources.
 
 - *Basic sources*: Sources directly available in the StreamingContext API.
   Examples: file systems, and socket connections.
-- *Advanced sources*: Sources like Kafka, Flume, Kinesis, Twitter, etc. are available through
+- *Advanced sources*: Sources like Kafka, Flume, Kinesis, etc. are available through
   extra utility classes. These require linking against extra dependencies as discussed in the
   [linking](#linking) section.
 
@@ -672,38 +669,12 @@ for Java, and [StreamingContext](api/python/pyspark.streaming.html#pyspark.strea
 {:.no_toc}
 
 <span class="badge" style="background-color: grey">Python API</span> As of Spark {{site.SPARK_VERSION_SHORT}},
-out of these sources, Kafka, Kinesis, Flume and MQTT are available in the Python API.
+out of these sources, Kafka, Kinesis and Flume are available in the Python API.
 
 This category of sources require interfacing with external non-Spark libraries, some of them with
 complex dependencies (e.g., Kafka and Flume). Hence, to minimize issues related to version conflicts
 of dependencies, the functionality to create DStreams from these sources has been moved to separate
-libraries that can be [linked](#linking) to explicitly when necessary. For example, if you want to
-create a DStream using data from Twitter's stream of tweets, you have to do the following:
-
-1. *Linking*: Add the artifact `spark-streaming-twitter_{{site.SCALA_BINARY_VERSION}}` to the
-  SBT/Maven project dependencies.
-1. *Programming*: Import the `TwitterUtils` class and create a DStream with
-  `TwitterUtils.createStream` as shown below.
-1. *Deploying*: Generate an uber JAR with all the dependencies (including the dependency
-  `spark-streaming-twitter_{{site.SCALA_BINARY_VERSION}}` and its transitive dependencies) and
-  then deploy the application. This is further explained in the [Deploying section](#deploying-applications).
-
-<div class="codetabs">
-<div data-lang="scala">
-{% highlight scala %}
-import org.apache.spark.streaming.twitter._
-
-TwitterUtils.createStream(ssc, None)
-{% endhighlight %}
-</div>
-<div data-lang="java">
-{% highlight java %}
-import org.apache.spark.streaming.twitter.*;
-
-TwitterUtils.createStream(jssc);
-{% endhighlight %}
-</div>
-</div>
+libraries that can be [linked](#linking) to explicitly when necessary.
 
 Note that these advanced sources are not available in the Spark shell, hence applications based on
 these advanced sources cannot be tested in the shell. If you really want to use them in the Spark
@@ -718,15 +689,6 @@ Some of these advanced sources are as follows.
 
 - **Kinesis:** Spark Streaming {{site.SPARK_VERSION_SHORT}} is compatible with Kinesis Client Library 1.2.1. See the [Kinesis Integration Guide](streaming-kinesis-integration.html) for more details.
 
-- **Twitter:** Spark Streaming's TwitterUtils uses Twitter4j to get the public stream of tweets using
-  [Twitter's Streaming API](https://dev.twitter.com/docs/streaming-apis). Authentication information
-  can be provided by any of the [methods](http://twitter4j.org/en/configuration.html) supported by
-  Twitter4J library. You can either get the public stream, or get the filtered stream based on a
-  keywords. See the API documentation ([Scala](api/scala/index.html#org.apache.spark.streaming.twitter.TwitterUtils$),
-  [Java](api/java/index.html?org/apache/spark/streaming/twitter/TwitterUtils.html)) and examples
-  ([TwitterPopularTags]({{site.SPARK_GITHUB_URL}}/blob/master/examples/src/main/scala/org/apache/spark/examples/streaming/TwitterPopularTags.scala)
-  and [TwitterAlgebirdCMS]({{site.SPARK_GITHUB_URL}}/blob/master/examples/src/main/scala/org/apache/spark/examples/streaming/TwitterAlgebirdCMS.scala)).
-
 ### Custom Sources
 {:.no_toc}
 
@@ -1927,10 +1889,10 @@ To run a Spark Streaming applications, you need to have the following.
 - *Package the application JAR* - You have to compile your streaming application into a JAR.
   If you are using [`spark-submit`](submitting-applications.html) to start the
   application, then you will not need to provide Spark and Spark Streaming in the JAR. However,
-  if your application uses [advanced sources](#advanced-sources) (e.g. Kafka, Flume, Twitter),
+  if your application uses [advanced sources](#advanced-sources) (e.g. Kafka, Flume),
   then you will have to package the extra artifact they link to, along with their dependencies,
-  in the JAR that is used to deploy the application. For example, an application using `TwitterUtils`
-  will have to include `spark-streaming-twitter_{{site.SCALA_BINARY_VERSION}}` and all its
+  in the JAR that is used to deploy the application. For example, an application using `KafkaUtils`
+  will have to include `spark-streaming-kafka_{{site.SCALA_BINARY_VERSION}}` and all its
   transitive dependencies in the application JAR.
 
 - *Configuring sufficient memory for the executors* - Since the received data must be stored in
@@ -2398,8 +2360,7 @@ additional effort may be necessary to achieve exactly-once semantics. There are
 Between Spark 0.9.1 and Spark 1.0, there were a few API changes made to ensure future API stability.
 This section elaborates the steps required to migrate your existing code to 1.0.
 
-**Input DStreams**: All operations that create an input stream (e.g., `StreamingContext.socketStream`,
-`FlumeUtils.createStream`, etc.) now returns
+**Input DStreams**: All operations that create an input stream (e.g., `StreamingContext.socketStream`, `FlumeUtils.createStream`, etc.) now returns
 [InputDStream](api/scala/index.html#org.apache.spark.streaming.dstream.InputDStream) /
 [ReceiverInputDStream](api/scala/index.html#org.apache.spark.streaming.dstream.ReceiverInputDStream)
 (instead of DStream) for Scala, and [JavaInputDStream](api/java/index.html?org/apache/spark/streaming/api/java/JavaInputDStream.html) /
@@ -2443,9 +2404,13 @@ Please refer to the project for more details.
 # Where to Go from Here
 * Additional guides
     - [Kafka Integration Guide](streaming-kafka-integration.html)
-    - [Flume Integration Guide](streaming-flume-integration.html)
     - [Kinesis Integration Guide](streaming-kinesis-integration.html)
     - [Custom Receiver Guide](streaming-custom-receivers.html)
+* External DStream data sources:
+    - [DStream MQTT](https://github.com/spark-packages/dstream-mqtt)
+    - [DStream Twitter](https://github.com/spark-packages/dstream-twitter)
+    - [DStream Akka](https://github.com/spark-packages/dstream-akka)
+    - [DStream ZeroMQ](https://github.com/spark-packages/dstream-zeromq)
 * API documentation
   - Scala docs
     * [StreamingContext](api/scala/index.html#org.apache.spark.streaming.StreamingContext) and
@@ -2453,9 +2418,6 @@ Please refer to the project for more details.
     * [KafkaUtils](api/scala/index.html#org.apache.spark.streaming.kafka.KafkaUtils$),
     [FlumeUtils](api/scala/index.html#org.apache.spark.streaming.flume.FlumeUtils$),
     [KinesisUtils](api/scala/index.html#org.apache.spark.streaming.kinesis.KinesisUtils$),
-    [TwitterUtils](api/scala/index.html#org.apache.spark.streaming.twitter.TwitterUtils$),
-    [ZeroMQUtils](api/scala/index.html#org.apache.spark.streaming.zeromq.ZeroMQUtils$), and
-    [MQTTUtils](api/scala/index.html#org.apache.spark.streaming.mqtt.MQTTUtils$)
   - Java docs
     * [JavaStreamingContext](api/java/index.html?org/apache/spark/streaming/api/java/JavaStreamingContext.html),
     [JavaDStream](api/java/index.html?org/apache/spark/streaming/api/java/JavaDStream.html) and
@@ -2463,9 +2425,6 @@ Please refer to the project for more details.
     * [KafkaUtils](api/java/index.html?org/apache/spark/streaming/kafka/KafkaUtils.html),
     [FlumeUtils](api/java/index.html?org/apache/spark/streaming/flume/FlumeUtils.html),
     [KinesisUtils](api/java/index.html?org/apache/spark/streaming/kinesis/KinesisUtils.html)
-    [TwitterUtils](api/java/index.html?org/apache/spark/streaming/twitter/TwitterUtils.html),
-    [ZeroMQUtils](api/java/index.html?org/apache/spark/streaming/zeromq/ZeroMQUtils.html), and
-    [MQTTUtils](api/java/index.html?org/apache/spark/streaming/mqtt/MQTTUtils.html)
   - Python docs
     * [StreamingContext](api/python/pyspark.streaming.html#pyspark.streaming.StreamingContext) and [DStream](api/python/pyspark.streaming.html#pyspark.streaming.DStream)
     * [KafkaUtils](api/python/pyspark.streaming.html#pyspark.streaming.kafka.KafkaUtils)
diff --git a/examples/src/main/python/streaming/mqtt_wordcount.py b/examples/src/main/python/streaming/mqtt_wordcount.py
deleted file mode 100644
index abf9c0e21d..0000000000
--- a/examples/src/main/python/streaming/mqtt_wordcount.py
+++ /dev/null
@@ -1,59 +0,0 @@
-#
-# Licensed to the Apache Software Foundation (ASF) under one or more
-# contributor license agreements.  See the NOTICE file distributed with
-# this work for additional information regarding copyright ownership.
-# The ASF licenses this file to You under the Apache License, Version 2.0
-# (the "License"); you may not use this file except in compliance with
-# the License.  You may obtain a copy of the License at
-#
-#    http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-"""
- A sample wordcount with MqttStream stream
- Usage: mqtt_wordcount.py <broker url> <topic>
-
- To run this in your local machine, you need to setup a MQTT broker and publisher first,
- Mosquitto is one of the open source MQTT Brokers, see
- http://mosquitto.org/
- Eclipse paho project provides number of clients and utilities for working with MQTT, see
- http://www.eclipse.org/paho/#getting-started
-
- and then run the example
-    `$ bin/spark-submit --jars \
-      external/mqtt-assembly/target/scala-*/spark-streaming-mqtt-assembly-*.jar \
-      examples/src/main/python/streaming/mqtt_wordcount.py \
-      tcp://localhost:1883 foo`
-"""
-
-import sys
-
-from pyspark import SparkContext
-from pyspark.streaming import StreamingContext
-from pyspark.streaming.mqtt import MQTTUtils
-
-if __name__ == "__main__":
-    if len(sys.argv) != 3:
-        print >> sys.stderr, "Usage: mqtt_wordcount.py <broker url> <topic>"
-        exit(-1)
-
-    sc = SparkContext(appName="PythonStreamingMQTTWordCount")
-    ssc = StreamingContext(sc, 1)
-
-    brokerUrl = sys.argv[1]
-    topic = sys.argv[2]
-
-    lines = MQTTUtils.createStream(ssc, brokerUrl, topic)
-    counts = lines.flatMap(lambda line: line.split(" ")) \
-        .map(lambda word: (word, 1)) \
-        .reduceByKey(lambda a, b: a+b)
-    counts.pprint()
-
-    ssc.start()
-    ssc.awaitTermination()
diff --git a/licenses/LICENSE-jblas.txt b/licenses/LICENSE-jblas.txt
deleted file mode 100644
index 5629dafb65..0000000000
--- a/licenses/LICENSE-jblas.txt
+++ /dev/null
@@ -1,31 +0,0 @@
-Copyright (c) 2009, Mikio L. Braun and contributors
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-    * Redistributions of source code must retain the above copyright
-      notice, this list of conditions and the following disclaimer.
-
-    * Redistributions in binary form must reproduce the above
-      copyright notice, this list of conditions and the following
-      disclaimer in the documentation and/or other materials provided
-      with the distribution.
-
-    * Neither the name of the Technische Universität Berlin nor the
-      names of its contributors may be used to endorse or promote
-      products derived from this software without specific prior
-      written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\ No newline at end of file
diff --git a/project/MimaBuild.scala b/project/MimaBuild.scala
index acf7b8961e..3dc1ceacde 100644
--- a/project/MimaBuild.scala
+++ b/project/MimaBuild.scala
@@ -88,16 +88,11 @@ object MimaBuild {
 
   def mimaSettings(sparkHome: File, projectRef: ProjectRef) = {
     val organization = "org.apache.spark"
-    // The resolvers setting for MQTT Repository is needed for mqttv3(1.0.1)
-    // because spark-streaming-mqtt(1.6.0) depends on it.
-    // Remove the setting on updating previousSparkVersion.
     val previousSparkVersion = "1.6.0"
     val fullId = "spark-" + projectRef.project + "_2.11"
     mimaDefaultSettings ++
     Seq(previousArtifact := Some(organization % fullId % previousSparkVersion),
-      binaryIssueFilters ++= ignoredABIProblems(sparkHome, version.value),
-      sbt.Keys.resolvers +=
-        "MQTT Repository" at "https://repo.eclipse.org/content/repositories/paho-releases")
+      binaryIssueFilters ++= ignoredABIProblems(sparkHome, version.value))
   }
 
 }
diff --git a/python/docs/pyspark.streaming.rst b/python/docs/pyspark.streaming.rst
index fc52a64754..25ceabac0a 100644
--- a/python/docs/pyspark.streaming.rst
+++ b/python/docs/pyspark.streaming.rst
@@ -29,10 +29,3 @@ pyspark.streaming.flume.module
     :members:
     :undoc-members:
     :show-inheritance:
-
-pyspark.streaming.mqtt module
------------------------------
-.. automodule:: pyspark.streaming.mqtt
-    :members:
-    :undoc-members:
-    :show-inheritance: