Nick Dimiduk created HBASE-25865:
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Summary: 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
Reporter: Nick Dimiduk
Assignee: Nick Dimiduk
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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