Bikas Saha created MAPREDUCE-4671:
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Summary: AM does not tell the RM about container requests that are
no longer needed
Key: MAPREDUCE-4671
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4671
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Bikas Saha
Assignee: Bikas Saha
Say the AM wanted a container at hosts h1, h2, h3. After getting a container at
h1 it should tell RM that it no longer needs containers at h2, h3. Otherwise on
the RM h2, h3 remain valid allocation locations.
The AM RMContainerAllocator does remove these resource requests internally.
When the resource request container count drops to 0 then it drops the resource
request from its tables but forgets to send the 0 sized request to the RM.
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