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+---
+layout: post
+title: Spark Release 1.2.1
+categories: []
+tags: []
+status: publish
+type: post
+published: true
+meta:
+  _edit_last: '4'
+  _wpas_done_all: '1'
+---
+
+Spark 1.2.1 is a maintenance release containing stability fixes. This release is based on the [branch-1.2](https://github.com/apache/spark/tree/branch-1.2) maintenance branch of Spark. We recommend all 1.2.0 users to upgrade to this stable release. Contributions to this release came from 69 developers.
+
+To download Spark 1.2.1 visit the <a href="{{site.url}}downloads.html">downloads</a> page.
+
+### Fixes
+Spark 1.2.1 contains bug fixes in several components. Some of the more important fixes are highlighted below. You can visit the [Spark issue tracker](http://s.apache.org/Mpn) for the full list of fixes.
+
+#### Security
+- Locks down file permissions for temporary file storage
+
+#### Spark Core
+- Netty shuffle ignores spark.blockManager.port ([SPARK-4837](https://issues.apache.org/jira/browse/SPARK-4837))
+- MetricsServlet does not initialize properly ([SPARK-4595](https://issues.apache.org/jira/browse/SPARK-4595))
+- Repl and YARN dependencies are not published to Maven ([SPARK-5289](https://issues.apache.org/jira/browse/SPARK-5289))
+- SparkConf is not thread safe ([SPARK-5355](https://issues.apache.org/jira/browse/SPARK-5355))
+- Byte code errors when linking against Spark ([SPARK-2075](https://issues.apache.org/jira/browse/SPARK-2075))
+
+#### SQL
+- CACHE TABLE AS SELECT fails with Hive UDFs ([SPARK-5187](https://issues.apache.org/jira/browse/SPARK-5187))
+- Attributes are case sensitive when using a select query from a projection ([SPARK-4959](https://issues.apache.org/jira/browse/SPARK-4959))
+- Spark SQL built for Hive 13 fails under concurrent metadata queries ([SPARK-4908](https://issues.apache.org/jira/browse/SPARK-4908))
+- Throw "Expression not in GROUP BY" when using same expression in group by clause and select clause ([SPARK-4296](https://issues.apache.org/jira/browse/SPARK-4296))
+
+#### Streaming
+- Proper file clean up for write ahead logs ([SPARK-5147](https://issues.apache.org/jira/browse/SPARK-5147))
+- Error with existing files during checkpoint recovery ([SPARK-4835](https://issues.apache.org/jira/browse/SPARK-4835))
+- Socket Receiver does not stop when streaming context is stopped ([SPARK-2892](https://issues.apache.org/jira/browse/SPARK-2892))
+
+#### PySpark
+- Parallelizing lists or arrays is slow ([SPARK-5224](https://issues.apache.org/jira/browse/SPARK-5224))
+- Serializer bug when using zip ([SPARK-4841](https://issues.apache.org/jira/browse/SPARK-4841))
+- Support Vector types within a dictionary ([SPARK-5223](https://issues.apache.org/jira/browse/SPARK-5223))
+
+### Contributors
+The following developers contributed to this release:
+
+ * Aaron Davidson -- Bug fixes in Core
+ * Alex Liu -- Improvements in Core and SQL; bug fixes in SQL
+ * Andrew Ash -- Documentation in Core
+ * Andrew Or -- Improvements in Core and YARN; bug fixes in Core and YARN
+ * Bilna -- Test in Streaming
+ * Brennon York -- Bug fixes in Core
+ * Cheng Hao -- Bug fixes in Core and SQL
+ * Cheng Lian -- Bug fixes in Core
+ * Christophe Preaud -- Improvements in Core
+ * Dale Richardson -- Improvement in Core
+ * Davies Liu -- Bug fixes in Core, MLlib, and PySpark
+ * Derek Ma -- Bug fixes in Shuffle
+ * Earne -- Improvements in Core and GraphX
+ * GuoQiang Li -- Bug fixes in Core and YARN
+ * Hari Shreedharan -- Bug fixes in Streaming
+ * Ilayaperumal Gopinathan -- Bug fixes in Streaming
+ * Ilya Ganelin -- Bug fixes in Core and Shuffle
+ * Jacek Lewandowski -- Bug fixes in Core
+ * Jeremy Freeman -- Bug fixes in MLlib and PySpark
+ * Jongyoul Lee -- Documentation in Streaming; bug fixes in Core and Mesos
+ * Joseph K. Bradley -- Bug fixes in Core, MLlib, and PySpark
+ * Josh Rosen -- Improvements in Core and SQL; new features in Core; bug fixes in Streaming and PySpark
+ * Kanwaljit Singh -- Bug fixes in Core
+ * Kenji Kikushima -- Bug fixes in GraphX
+ * Kousuke Saruta -- Bug fixes in Core and Web UI
+ * Lianhui Wang -- Bug fixes in Core
+ * Madhu Siddalingaiah -- Documentation in Core
+ * Marcelo Vanzin -- Bug fixes in Core
+ * Michael Armbrust -- Improvements in Core; bug fixes in SQL
+ * Michael Davies -- Improvements in SQL
+ * Nan Zhu -- Improvements and bug fixes in Streaming
+ * Nathan Kronenfeld -- Bug fixes in Core
+ * Nicholas Chammas -- Documentation in Core
+ * Patrick Wendell -- Improvements and documentation in Core
+ * Peter Klipfel -- Documentation in Core
+ * Peter Vandenabeele -- Documentation in Core
+ * Ryan Williams -- Improvements, bug fixes, and documentation in Core
+ * SaintBacchus -- Bug fixes in Core and YARN
+ * Saisai Shao -- Bug fixes in Core
+ * Saisai Shao -- Improvements in Streaming; bug fixes in Streaming and SQL; improvement in Streaming
+ * Sandy Ryza -- Improvements in Core
+ * Sean Owen -- Improvements in Core; wish in Core; documentation in Core; bug fixes in Java API, Core, and SQL
+ * Shixiong Zhu -- Improvements in Streaming and Shuffle; bug fixes in Core and Streaming; documentation in Core and YARN
+ * Su Yan -- Improvements in Core; bug fixes in Core and Web UI
+ * Takeshi Yamamuro -- Improvements and bug fixes in GraphX
+ * Tathagata Das -- Improvements and improvement in Streaming
+ * Timothy Chen -- Documentation in Core
+ * Tingjun Xu -- Bug fixes in YARN
+ * Tsuyoshi Ozawa -- Documentation in Core and YARN
+ * UncleGen -- Improvements in Web UI; bug fixes in Core
+ * Venkata Ramana Gollamudi -- Bug fixes in Core
+ * Wang Tao -- Bug fixes in Core
+ * Xiangrui Meng -- Documentation in MLlib
+ * Xiaohua Yi -- Bug fixes in SQL
+ * Xiaojing Wang -- Documentation in Core
+ * Yash Datta -- Bug fixes in SQL
+ * Ye Xianjin -- Bug fixes in Core
+ * Yuhao Yang -- Improvements and bug fixes in MLlib
+ * Zhang, Liye -- Improvements in Web UI
+
+_Thanks to everyone who contributed!_
+