Kousuke Saruta created SPARK-4949:
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Summary: shutdownCallback in SparkDeploySchedulerBackend should be
enclosed by synchronized block.
Key: SPARK-4949
URL: https://issues.apache.org/jira/browse/SPARK-4949
Project: Spark
Issue Type: Bug
Components: Spark Core
Affects Versions: 1.3.0
Reporter: Kousuke Saruta
A variable `shutdownCallback` in SparkDeploySchedulerBackend can be accessed
from multiple threads so it should be enclosed by synchronized block.
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