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https://issues.apache.org/jira/browse/HBASE-24795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17167452#comment-17167452
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Viraj Jasani commented on HBASE-24795:
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Yes --noack is good one, however, graceful start/stop used by deployment tool
would want to use withAck as they need to know the progress, and here we are
just proposing to ignore those regions which do not exist. But yeah, --noack
always serves the purpose.
> RegionMover should deal with unknown (split/merged) regions
> -----------------------------------------------------------
>
> Key: HBASE-24795
> URL: https://issues.apache.org/jira/browse/HBASE-24795
> Project: HBase
> Issue Type: New Feature
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Major
>
> 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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