Li Lu created YARN-6323:
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Summary: Rolling upgrade/config change is broken on timeline v2.
Key: YARN-6323
URL: https://issues.apache.org/jira/browse/YARN-6323
Project: Hadoop YARN
Issue Type: Sub-task
Reporter: Li Lu
Found this issue when deploying on real clusters. If there are apps running
when we enable timeline v2 (with work preserving restart enabled), node
managers will fail to start due to missing app context data. We should probably
assign some default names to these "left over" apps. I believe it's suboptimal
to let users clean up the whole cluster before enabling timeline v2.
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