Revive number of files listed metrics
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Key: HADOOP-4694
URL: https://issues.apache.org/jira/browse/HADOOP-4694
Project: Hadoop Core
Issue Type: New Feature
Components: dfs, metrics
Affects Versions: 0.18.0
Reporter: Koji Noguchi
When namenode becomes unresponsive by HADOOP-4693 (large filelist calls),
metrics has been helpful in finding out the cause.
When gc time hikes, "FileListed" metrics also hiked.
In 0.18, after we *fixed* "FileListed" metrics so that it shows number of
operations instead of number of files listed (HADOOP-3683), I stopped seeing
this relationship graph.
Can we bring back "NumbverOfFilesListed" metrics?
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