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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10534) NameNode WebUI should display DataNode usage histogram
Date Tue, 15 Nov 2016 00:28:58 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15665516#comment-15665516

Zhe Zhang commented on HDFS-10534:

Thanks Kai again for the work, and sorry for the late review. I actually didn't find an easier
way to generate histogram from dust.

The histogram looks pretty nice! The only concern I have is that it is a little too wide and
requires scrolling to the right to view the full picture. Meanwhile, i think each bar can
be narrower which should save space to display the whole picture.

+1 pending this change. Thanks.

> NameNode WebUI should display DataNode usage histogram
> ------------------------------------------------------
>                 Key: HDFS-10534
>                 URL: https://issues.apache.org/jira/browse/HDFS-10534
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode, ui
>            Reporter: Zhe Zhang
>            Assignee: Kai Sasaki
>         Attachments: HDFS-10534.01.patch, HDFS-10534.02.patch, HDFS-10534.03.patch, HDFS-10534.04.patch,
HDFS-10534.05.patch, HDFS-10534.06.patch, HDFS-10534.07.patch, HDFS-10534.08.patch, Screen
Shot 2016-06-23 at 6.25.50 AM.png, Screen Shot 2016-07-07 at 23.29.14.png, table_histogram.html
> In addition of *Min/Median/Max*, another meaningful metric for cluster balance is DN
usage in histogram style.
> Since NN already has provided necessary information to calculate histogram of DN usage,
it can be done in JS side.

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