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Kousuke Saruta 82197ed3bd [SPARK-4949]shutdownCallback in SparkDeploySchedulerBackend should be enclosed by synchronized block. 
A variable `shutdownCallback` in SparkDeploySchedulerBackend can be accessed from multiple threads so it should be enclosed by synchronized block.

Author: Kousuke Saruta <sarutak@oss.nttdata.co.jp>

Closes #3781 from sarutak/SPARK-4949 and squashes the following commits:

c146c93 [Kousuke Saruta] Removed "setShutdownCallback" method
c7265dc [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-4949
42ca528 [Kousuke Saruta] Changed the declaration of the variable "shutdownCallback" as a volatile reference instead of AtomicReference
552df7c [Kousuke Saruta] Changed the declaration of the variable "shutdownCallback" as a volatile reference instead of AtomicReference
f556819 [Kousuke Saruta] Merge branch 'master' of git://git.apache.org/spark into SPARK-4949
1b60fd1 [Kousuke Saruta] Improved the locking logics
5942765 [Kousuke Saruta] Enclosed shutdownCallback in SparkDeploySchedulerBackend by synchronized block
2015-02-18 12:20:11 +00:00
..
java/org/apache/spark [SPARK-5549] Define TaskContext interface in Scala. 2015-02-03 00:46:04 -08:00
resources/org/apache/spark [SPARK-5645] Added local read bytes/time to task metrics 2015-02-12 14:36:27 -08:00
scala/org/apache/spark [SPARK-4949]shutdownCallback in SparkDeploySchedulerBackend should be enclosed by synchronized block. 2015-02-18 12:20:11 +00:00