Shixiong Zhu created SPARK-9639:
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Summary: JobHandler may throw NPE if JobScheduler has been stopped
Key: SPARK-9639
URL: https://issues.apache.org/jira/browse/SPARK-9639
Project: Spark
Issue Type: Bug
Components: Streaming
Reporter: Shixiong Zhu
Because `JobScheduler.stop(false)` may set `eventLoop` to null when
`JobHandler` is running, then it's possible that when `post` is called,
`eventLoop` happens to null.
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