AM releases too many containers due to the protocol
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Key: MAPREDUCE-2694
URL: https://issues.apache.org/jira/browse/MAPREDUCE-2694
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Arun C Murthy
Assignee: Sharad Agarwal
- AM sends request asking 4 containers on host H1.
- Asynchronously, host H1 reaches RM and gets assigned 4 containers. RM at this
point, sets the value against H1 to
zero in its aggregate request-table for all apps.
- In the mean-while AM gets to need 3 more containers, so a total of 7
including the 4 from previous request.
- Today, AM sends the absolute number of 7 against H1 to RM as part of its
request table.
- RM seems to be overriding its earlier value of zero against H1 to 7 against
H1. And thus allocating 7 more
containers.
- AM already gets 4 in this scheduling iteration, but gets 7 more, a total of
11 instead of the required 7.
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