Luke Lu created MAPREDUCE-5381:
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Summary: Support graceful decomission of tasktracker
Key: MAPREDUCE-5381
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5381
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: mrv1
Affects Versions: 1.2.0
Reporter: Luke Lu
Assignee: Binglin Chang
When TTs are decommissioned for non-fault reasons (capacity change etc.), it's
desirable to minimize the impact to running jobs.
Currently if a TT is decommissioned, all running tasks on the TT need to be
rescheduled on other TTs. 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
tasktracker.
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