Luke Lu created YARN-914:
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Summary: Support graceful decommission of nodemanager
Key: YARN-914
URL: https://issues.apache.org/jira/browse/YARN-914
Project: Hadoop YARN
Issue Type: Improvement
Affects Versions: 2.0.4-alpha
Reporter: Luke Lu
Assignee: Junping Du
When NNs are decommissioned for non-fault reasons (capacity change etc.), it's
desirable to minimize the impact to running applications.
Currently if a NN is decommissioned, all running containers on the NN need to
be rescheduled on other NNs. Further more, for finished map tasks, if their map
output are not fetched by the reducers of the job, these map tasks will need to
be rerun as well.
We propose to introduce a mechanism to optionally gracefully decommission a
node manager.
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