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https://issues.apache.org/jira/browse/HDFS-12502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16193644#comment-16193644
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Zhe Zhang commented on HDFS-12502:
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Among the reported UT failures, {{TestUnderReplicatedBlocks}} seems to be
failing even without the patch. Others pass locally. From code logic, this
patch is unrelated to these tests, since none of them calls {{listStatus}}.
> nntop should support a category based on FilesInGetListingOps
> -------------------------------------------------------------
>
> Key: HDFS-12502
> URL: https://issues.apache.org/jira/browse/HDFS-12502
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: metrics
> Reporter: Zhe Zhang
> Assignee: Zhe Zhang
> Attachments: HDFS-12502.00.patch, HDFS-12502.01.patch,
> HDFS-12502.02.patch, HDFS-12502.03.patch
>
>
> Large listing ops can oftentimes be the main contributor to NameNode
> slowness. The aggregate cost of listing ops is proportional to the
> {{FilesInGetListingOps}} rather than the number of listing ops. Therefore
> it'd be very useful for nntop to support this category.
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