Adding 1.0.1 release of Spark.

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+---
+layout: post
+title: Spark Release 1.0.1
+categories: []
+tags: []
+status: publish
+type: post
+published: true
+meta:
+  _edit_last: '4'
+  _wpas_done_all: '1'
+---
+
+Spark 1.0.1 is a maintenance release with several stability fixes and a few new features in Spark’s SQL (alpha) library. This release is based on the [branch-1.0](https://github.com/apache/spark/tree/branch-1.0) maintenance branch of Spark. We recommend users follow the head of this branch to get the most recent stable version of Spark.
+
+You can download Spark 1.0.1 as either a 
+<a href="http://d3kbcqa49mib13.cloudfront.net/spark-1.0.1.tgz" onClick="trackOutboundLink(this, 'Release Download Links', 'cloudfront_spark-1.0.1.tgz'); return false;">source package</a>
+(5 MB tgz) or a prebuilt package for 
+<a href="http://d3kbcqa49mib13.cloudfront.net/spark-1.0.1-bin-hadoop1.tgz" onClick="trackOutboundLink(this, 'Release Download Links', 'cloudfront_spark-1.0.1-bin-hadoop1.tgz'); return false;">Hadoop 1 / CDH3</a>, 
+<a href="http://d3kbcqa49mib13.cloudfront.net/spark-1.0.1-bin-cdh4.tgz" onClick="trackOutboundLink(this, 'Release Download Links', 'cloudfront_spark-1.0.1-bin-cdh4.tgz'); return false;">CDH4</a>, or
+<a href="http://d3kbcqa49mib13.cloudfront.net/spark-1.0.1-bin-hadoop2.tgz" onClick="trackOutboundLink(this, 'Release Download Links', 'cloudfront_spark-1.0.1-bin-hadoop2.tgz'); return false;">Hadoop 2 / CDH5 / HDP2</a>
+(160 MB tgz). Release signatures and checksums are available at the official [Apache download site](http://www.apache.org/dist/spark/spark-1.0.1/).
+
+### Fixes
+Spark 1.0.1 contains stability fixes in several components. Some of the more important fixes are highlighted below. You can visit the [Spark issue tracker](http://s.apache.org/5zh) for an exhaustive list of fixes.
+
+#### Spark Core
+ - Issue with missing keys during external aggregations ([SPARK-2043](https://issues.apache.org/jira/browse/SPARK-2043))
+ - Issue during job failures in Mesos mode ([SPARK-1749](https://issues.apache.org/jira/browse/SPARK-1749))
+ - Error when defining case classes in Scala shell ([SPARK-1199](https://issues.apache.org/jira/browse/SPARK-1199))
+ - Proper support for r3.xlarge instances on AWS ([SPARK-1790](https://issues.apache.org/jira/browse/SPARK-1790))
+
+#### PySpark
+ - Issue causing crashes when large numbers of tasks finish quickly ([SPARK-2282](https://issues.apache.org/jira/browse/SPARK-2282))
+ - Issue importing MLlib in YARN-client mode ([SPARK-2172](https://issues.apache.org/jira/browse/SPARK-2172))
+ - Incorrect behavior when hashing None ([SPARK-1468](https://issues.apache.org/jira/browse/SPARK-1468))
+ 
+#### MLlib
+ - Added compatibility for numpy 1.4 ([SPARK-2091](https://issues.apache.org/jira/browse/SPARK-2091))
+ - Concurrency issue in random sampler ([SPARK-2251](https://issues.apache.org/jira/browse/SPARK-2251))
+ - NotSerailizable exception in ALS ([SPARK-1977](https://issues.apache.org/jira/browse/SPARK-1977))
+
+#### Streaming
+ - Key not found when slow receiver starts ([SPARK-2009](https://issues.apache.org/jira/browse/SPARK-2009))
+ - Resource clean-up with KafkaInputDStream ([SPARK-2034](https://issues.apache.org/jira/browse/SPARK-2034))
+ - Issue with Flume events larger than 1020 bytes ([SPARK-1916](https://issues.apache.org/jira/browse/SPARK-1916))
+
+### SparkSQL Features
+ - Support for querying JSON datasets ([SPARK-2060](https://issues.apache.org/jira/browse/SPARK-2060)).
+ - Improved reading and writing Parquet data, including support for nested records and arrays ([SPARK-1293](https://issues.apache.org/jira/browse/SPARK-1293), [SPARK-2195](https://issues.apache.org/jira/browse/SPARK-2195), [SPARK-1913](https://issues.apache.org/jira/browse/SPARK-1913), and [SPARK-1487](https://issues.apache.org/jira/browse/SPARK-1487)).
+ - Improved support for SQL commands (`CACHE TABLE`, `DESCRIBE`, SHOW TABLES) ([SPARK-1968](https://issues.apache.org/jira/browse/SPARK-1968), [SPARK-2128](https://issues.apache.org/jira/browse/SPARK-2128), and [SPARK-1704](https://issues.apache.org/jira/browse/SPARK-1704)).
+ - Support for SQL specific configuration (initially used for setting number of partitions) ([SPARK-1508](https://issues.apache.org/jira/browse/SPARK-1508)).
+ - Idempotence for DDL operations ([SPARK-2191](https://issues.apache.org/jira/browse/SPARK-2191)).
+
+### Known Issues
+This release contains one known issue: multi-statement lines the REPL with internal references (`> val x = 10; val y = x + 10`) produce exceptions ([SPARK-2452](https://issues.apache.org/jira/browse/SPARK-2452)). This will be fixed shortly on the 1.0 branch; the fix will be included in the 1.0.2 release.
+
+### Contributors
+The following developers contributed to this release:
+
+ * Aaron Davidson -- bug fixes in PySpark and Spark core
+ * Ali Ghodsi -- documentation update
+ * Anant -- compatibility fix for spark-ec2 script
+ * Anatoli Fomenko -- MLlib doc fix
+ * Andre Schumacher -- nested Parquet data
+ * Andrew Ash -- documentation
+ * Andrew Or -- bug fixes and documentation
+ * Ankur Dave -- bug fixes
+ * Arkadiusz Komarzewski -- doc fix
+ * Baishuo -- sql fix
+ * Chen Chao -- comment fix and bug fix
+ * Cheng Hao -- SQL features
+ * Cheng Lian -- SQL features
+ * Christian Tzolov -- build improvmenet
+ * Clément MATHIEU -- doc updates 
+ * CodingCat -- doc updates and bug fix 
+ * Colin McCabe -- bug fix
+ * Daoyuan -- SQL joins
+ * David Lemieux -- bug fix
+ * Derek Ma -- bug fix
+ * Doris Xin -- bug fix
+ * Erik Selin -- PySpark fix
+ * Gang Bai -- bug fix
+ * Guoqiang Li -- bug fixes
+ * Henry Saputra -- documentation
+ * Jiang -- doc fix
+ * Joy Yoj -- bug fix
+ * Jyotiska NK -- test improvement
+ * Kan Zhang -- PySpark SQL features
+ * Kay Ousterhout -- documentation fix
+ * LY Lai -- bug fix
+ * Lars Albertsson -- bug fix 
+ * Lei Zhang -- SQL fix and feature
+ * Mark Hamstra -- bug fix
+ * Matei Zaharia -- doc updates and bug fix
+ * Matthew Farrellee -- bug fixes
+ * Michael Armbrust -- sql features and fixes
+ * Neville Li -- buf fix
+ * Nick Chammas -- doc fix
+ * Ori Kremer -- bug fix
+ * Patrick Wendell -- documentation and release manager
+ * Prashant Sharma -- bug and doc fixes
+ * Qiuzhuang.Lian -- bug fix
+ * Raymond Liu -- bug fix
+ * Ravikanth Nawada -- bug fixes
+ * Reynold Xin  -- bug and doc fixes
+ * Sameer Agarwal -- optimization
+ * Sandy Ryza -- doc fix
+ * Sean Owen -- bug fix
+ * Sebastien Rainville -- bug fix
+ * Shixiong Zhu -- code clean-up
+ * Szul, Piotr -- bug fix
+ * Takuya UESHIN -- bug fixes and SQL features
+ * Thomas Graves -- bug fix 
+ * Uri Laserson -- bug fix
+ * Vadim Chekan -- bug fix
+ * Varakhedi Sujeet -- ec2 r3 support
+ * Vlad -- doc fix
+ * Wang Lianhui -- bug fix
+ * Wenchen Fan -- optimization
+ * William Benton -- SQL feature
+ * Xi Liu -- SQL feature
+ * Xiangrui Meng -- bug fix
+ * Ximo Guanter Gonzalbez -- SQL feature
+ * Yadid Ayzenberg -- doc fix
+ * Yijie Shen -- buf fix
+ * Yin Huai -- JSON support and bug fixes
+ * Zhen Peng -- bug fix
+ * Zichuan Ye -- ec2 fixes
+ * Zongheng Yang  -- sql fixes
+
+_Thanks to everyone who contributed!_