Dongjoon Hyun created SPARK-15913:
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Summary: Dispatcher.stopped should be enclosed by synchronized
block.
Key: SPARK-15913
URL: https://issues.apache.org/jira/browse/SPARK-15913
Project: Spark
Issue Type: Bug
Components: Spark Core
Reporter: Dongjoon Hyun
Dispatcher.stopped is guarded by `this`, but it is used without synchronization
in `postMessage` function. This issue fixes this.
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