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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12502) nntop should support a category based on FilesInGetListingOps
Date Thu, 05 Oct 2017 17:35:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12502?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Zhe Zhang updated HDFS-12502:
    Attachment: HDFS-12502.02.patch

Thanks [~shv]! Updating the patch to address comments. Actually the reported UT failures were
due to the NPE. Also added JavaDoc and comments.

> 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
> 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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