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https://issues.apache.org/jira/browse/HDFS-10534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15352001#comment-15352001
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Andrew Wang commented on HDFS-10534:
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bq. This is also a metric that could be calculated in client-side JS from
existing information.
To clarify this a bit more, the NN webUI is mostly built in JS right now. Is it
possible to calculate the histogram in JS as well? Then we don't need to add
this new metric.
I imagine that other monitoring tools consuming JMX are already doing similar
things for their alerting thresholds, since the raw data is already available.
The metric added in this patch doesn't expose more information the same way our
RPC latency histograms do, which limits its utility. Monitoring tools probably
already have business logic for defining these alerting thresholds, and doing
it there is more expressive too.
> NameNode WebUI should display DataNode usage rate with a certain percentile
> ---------------------------------------------------------------------------
>
> 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, Screen Shot
> 2016-06-23 at 6.25.50 AM.png
>
>
> In addition of *Min/Median/Max*, another meaningful metric for cluster
> balance is DN usage rate at a certain percentile (e.g. 90 or 95). We should
> add a config option, and another filed on NN WebUI, to display this.
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