[jira] [Created] (HBASE-24527) Improve region housekeeping status observability

["Andrew Kyle Purtell (Jira)" <ji...@apache.org>]

Andrew Kyle Purtell created HBASE-24527:
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             Summary: 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, shell, UI
            Reporter: Andrew Kyle Purtell


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. 

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



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