[jira] Updated: (HDFS-204) Revive number of files listed metrics

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-204?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE updated HDFS-204:
----------------------------------------

    Component/s: name-node

> 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: 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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