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https://issues.apache.org/jira/browse/HBASE-25865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nick Dimiduk resolved HBASE-25865.
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Resolution: Fixed
> Visualize current state of region assignment
> --------------------------------------------
>
> Key: HBASE-25865
> URL: https://issues.apache.org/jira/browse/HBASE-25865
> Project: HBase
> Issue Type: New Feature
> Components: master, Operability, Usability
> Reporter: Nick Dimiduk
> Assignee: Nick Dimiduk
> Priority: Blocker
> Fix For: 2.5.0, 2.6.0, 3.0.0-alpha-3
>
> Attachments: image1.png, image2.png
>
>
> After several months of debugging and tuning the balancer and normalizer on a
> large production cluster, we found that working from visualizations of the
> current region state was very useful for understanding behaviors and
> quantifying improvements we made along the way. Specifically, we found that a
> chart of total assigned region count and total assigned region store files
> size per table per host was immensely useful for tuning the balancer.
> Histograms of store file size made understanding normalizer activity much
> more intuitive.
> Our scripts would parse the output of the shell's {{status 'detailed'}}
> command, extract the desired metric, and produce charts. I'd like to build
> into the master UI the equivalent functionality, with data coming directly
> from the {{ClusterMetrics object}}, and data rendered into an interactive
> chart rendered in the browser.
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