GitHub user dongjoon-hyun opened a pull request:
https://github.com/apache/spark/pull/13634
[SPARK-15913][CORE] Dispatcher.stopped should be enclosed by synchronized
block.
## What changes were proposed in this pull request?
`Dispatcher.stopped` is guarded by `this`, but it is used without
synchronization in `postMessage` function. This PR fixes this and also the
exception message became more accurate.
## How was this patch tested?
Pass the existing Jenkins tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/dongjoon-hyun/spark SPARK-15913
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/13634.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 #13634
----
commit 75a5254371374faf66f166e1b2683d3f9803cb8e
Author: Dongjoon Hyun <dongj...@apache.org>
Date: 2016-06-13T05:53:47Z
[SPARK-15913][CORE] Dispatcher.stopped should be enclosed by synchronized
block.
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