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https://issues.apache.org/jira/browse/HDFS-204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hairong Kuang updated HDFS-204:
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Attachment: getFileNum-yahoo20.patch
This patch ported the feature to Yahoo 20 branch. In addition, it fixed the bug
that NPE will be thrown when getListing on a non-existent path and I also added
two more test cases, one is listing a non-existent path and one is listing path
represented a file.
> Revive number of files listed metrics
> -------------------------------------
>
> Key: HDFS-204
> URL: https://issues.apache.org/jira/browse/HDFS-204
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: name-node
> Affects Versions: 0.21.0
> Reporter: Koji Noguchi
> Assignee: Jitendra Nath Pandey
> Fix For: 0.21.0
>
> Attachments: getFileNum-yahoo20.patch, HDFS-204-2.patch,
> HDFS-204-2.patch, HDFS-204.patch, HDFS-204.patch
>
>
> 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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