FAQ
Counters occupy a good part of AM heap
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Key: MAPREDUCE-3511
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3511
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2
Affects Versions: 0.23.1
Reporter: Siddharth Seth


Per task counters seem to be occupying a good part of an AMs heap. Looks like more than 50% of what's used by a TaskAttemptImpl object.
This could be optimized by interning strings or possibly using mrv1 counters which are optimized. Currently counters are converted from mrv1 to mrv2 format for in memory storage. The conversion could be delayed till it's actually required for RPC transfers.

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