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https://issues.apache.org/jira/browse/HBASE-24527?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17132673#comment-17132673
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Sean Busbey commented on HBASE-24527:
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subscribed; thanks for the heads-up
> Improve region housekeeping status observability
> ------------------------------------------------
>
> Key: HBASE-24527
> URL: https://issues.apache.org/jira/browse/HBASE-24527
> Project: HBase
> Issue Type: New Feature
> Components: Admin, Compaction, Operability, shell, UI
> Reporter: Andrew Kyle Purtell
> Priority: Major
>
> We provide a coarse grained admin API and associated shell command for
> determining the compaction status of a table:
> {noformat}
> hbase(main):001:0> help "compaction_state"
> Here is some help for this command:
> Gets compaction status (MAJOR, MAJOR_AND_MINOR, MINOR, NONE) for a table:
> hbase> compaction_state 'ns1:t1'
> hbase> compaction_state 't1'
> {noformat}
> We also log compaction activity, including a compaction journal at
> completion, via log4j to whatever log aggregation solution is available in
> production.
> This is not sufficient for online and interactive observation, debugging, or
> performance analysis of current compaction activity. In this kind of activity
> an operator is attempting to observe and analyze compaction activity in real
> time. Log aggregation and presentation solutions have typical latencies (end
> to end visibility of log lines on the order of ~minutes) which make that not
> possible today.
> We don't offer any API or tools for directly interrogating split and merge
> activity in real time. Some indirect knowledge of split or merge activity can
> be inferred from RIT information via ClusterStatus. It can also be scraped,
> with some difficulty, from the debug servlet.
> We should have new APIs and shell commands, and perhaps also new admin UI
> views, for
> at regionserver scope:
> * listing the current state of a regionserver's compaction, split, and merge
> tasks and threads
> * counting (simple view) and listing (detailed view) a regionserver's
> compaction queues
> * listing a region's currently compacting, splitting, or merging status
> at master scope, aggregations of the above detailed information into:
> * listing the active compaction tasks and threads for a given table, the
> extension of _compaction_state_ with a new detailed view
> * listing the active split or merge tasks and threads for a given table's
> regions
> Compaction detail should include the names of the effective engine and policy
> classes, and the results and timestamp of the last compaction selection
> evaluation. Split and merge detail should include the names of the effective
> policy classes and the result of the last split or merge criteria evaluation.
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