shuiqiangchen created FLINK-17700:
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Summary: The callback client of JavaGatewayServer should run in a
daemon thread
Key: FLINK-17700
URL: https://issues.apache.org/jira/browse/FLINK-17700
Project: Flink
Issue Type: Bug
Components: API / Python
Affects Versions: 1.10.0, 1.9.0
Reporter: shuiqiangchen
Fix For: 1.10.0, 1.9.0
When starting the JavaGatewayServer, a callback client would also be created
and run in an ScheduleExecutorService's thread which is non-daemon by default.
Thus, we need to shut down the non-daemon thread and reset a daemon thread back
to the call back client.
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