Devaraj K created MAPREDUCE-5622:
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Summary: MRAppMaster doesn't assign all allocated NODE_LOCAL
containers to node-local maps
Key: MAPREDUCE-5622
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5622
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: applicationmaster
Affects Versions: 2.2.0
Reporter: Devaraj K
MRAppMaster will request containers for all the splits to launch map tasks, RM
will give Node Local containers for all these if available. When the RM gives
all containers as Node Local, MR AM may assign these NODE-LOCAL containers to
non-local maps.
\\
\\
|node1|split1|split2| |split4|
|node2| |split2|split3| |
|node3|split1|split2|split3|split4|
|node4|split1| |split3|split4|
\\
Consider this instance, assume RM has given one NODE LOCAL container on each
node to process all the splits as local maps. While assigning, if the AM gives
node1-container for split1, node2-container for split3, node3-container for
split3 and node4-container can be given to only split2 which is not local.
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