Make Yarn Client service shutdown operations robust
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Key: MAPREDUCE-4023
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4023
Project: Hadoop Map/Reduce
Issue Type: Sub-task
Components: mrv2
Affects Versions: 0.24.0, 0.23.2
Reporter: Steve Loughran
Assignee: Steve Loughran
Priority: Minor
Attachments: MAPREDUCE-4023.patch
Make the yarn client services more robust against being shut down while not
started, or shutdown more than once, by null-checking fields before closing
them, setting to null afterwards to prevent double-invocation. This is a subset
of MAPREDUCE-3502
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