[jira] [Updated] (HBASE-24795) RegionMover should deal with unknown (split/merged) regions

["Viraj Jasani (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-24795?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Viraj Jasani updated HBASE-24795:
---------------------------------
    Fix Version/s: 2.4.0
                   2.3.1
                   3.0.0-alpha-1

> RegionMover should deal with unknown (split/merged) regions
> -----------------------------------------------------------
>
>                 Key: HBASE-24795
>                 URL: https://issues.apache.org/jira/browse/HBASE-24795
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Viraj Jasani
>            Assignee: Viraj Jasani
>            Priority: Major
>             Fix For: 3.0.0-alpha-1, 2.3.1, 2.4.0
>
>
> For a cluster with very high load, it is quite common to see flush/compaction happening every minute on each RegionServer. And we have quite high chances of multiple regions going through splitting/merging.
> RegionMover, while unloading all regions (graceful stop), writes down all regions to a local file and while loading them back (graceful start), ensures to bring every single region back from other RSs. While loading regions back, even if a single region can't be moved back, RegionMover considers load() failure. We miss out on possibilities of some regions going through split/merge process and the fact that not all regions written to local file might even exist anymore. Hence, RegionMover should gracefully handle moving any unknown region without marking load() failed.



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