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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