[jira] [Work started] (HBASE-23371) [HBCK2] Provide client side method for removing "ghost" regions in meta.

["Wellington Chevreuil (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-23371?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HBASE-23371 started by Wellington Chevreuil.
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> [HBCK2] Provide client side method for removing "ghost" regions in meta. 
> -------------------------------------------------------------------------
>
>                 Key: HBASE-23371
>                 URL: https://issues.apache.org/jira/browse/HBASE-23371
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Wellington Chevreuil
>            Assignee: Wellington Chevreuil
>            Priority: Major
>
> We found some customers facing problems where region entries are present in meta, but no related region dir is available on the underlying files system. The actual cause couldn't be confirmed with certainty, and this was happening on a cluster version that doesn't support server side *fixMeta* command. Ultimately, solution was to manual delete the extra regions from meta. 
> This ticket proposes two new client side commands for HBCK2, similar to the already existing *addFsRegionsMissingInMeta* and *reportMissingRegionsInMeta*, for finding and cleaning out meta from inconsistent state, when no *fixMeta* is available (which is the case for any version prior to "2.0.6", "2.1.6", "2.2.1", "2.3.0","3.0.0").



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