GitHub user sarutak opened a pull request:
https://github.com/apache/spark/pull/3781
[SPARK-4949] [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.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/sarutak/spark SPARK-4949
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/3781.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3781
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commit 5942765c27f908767035d2b15dcf8f7482e4a9db
Author: Kousuke Saruta <saru...@oss.nttdata.co.jp>
Date: 2014-12-24T04:35:00Z
Enclosed shutdownCallback in SparkDeploySchedulerBackend by synchronized
block
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