Todd Lipcon created MAPREDUCE-4229:
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Summary: Intern counter names in the JT
Key: MAPREDUCE-4229
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4229
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: jobtracker
Affects Versions: 1.0.2
Reporter: Todd Lipcon
In our experience, most of the memory in production JTs goes to storing counter
names (String objects and character arrays). Since most counter names are
reused again and again, it would be a big memory savings to keep a hash set of
already-used counter names within a job, and refer to the same object from all
tasks.
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