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https://issues.apache.org/jira/browse/HDFS-16882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17677052#comment-17677052
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ASF GitHub Bot commented on HDFS-16882:
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hfutatzhanghb commented on PR #5276:
URL: https://github.com/apache/hadoop/pull/5276#issuecomment-1383179119

   hi, @ayushtkn @goiri . could you please help me review the codes, thanks.




> RBF: Add cache hit rate metric in MountTableResolver#getDestinationForPath
> --------------------------------------------------------------------------
>
>                 Key: HDFS-16882
>                 URL: https://issues.apache.org/jira/browse/HDFS-16882
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: rbf
>    Affects Versions: 3.3.4
>            Reporter: ZhangHB
>            Priority: Minor
>              Labels: pull-request-available
>         Attachments: locationCache.png
>
>
> Currently, the default value of 
> "dfs.federation.router.mount-table.cache.enable" is true and the default 
> value of "dfs.federation.router.mount-table.max-cache-size" is 10000.
> But there is no metric that display cache hit rate, I think we can add a hit 
> rate metric to watch the Cache performance and better tuning the parameters.



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