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https://issues.apache.org/jira/browse/HBASE-22707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16891066#comment-16891066
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Wellington Chevreuil commented on HBASE-22707:
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Yeah, using _joinCluster_ was a bit too much of an attempt of reusing existing
code without changing it as much as possible, but I agree with all the side
effects you had pointed out, [~stack]. Had done some refactoring to re-use some
of the loadMeta#visitRegionState, adding a
[PR|https://github.com/apache/hbase/pull/403] with the changes. Let me know
what you think, if you feel this PR approach is fine, I will work on some UTs
for it.
> [HBCK2] MasterRpcServices assigns method should try to reload regions from
> meta if the passed regions isn't found under AssignmentManager
> RegionsStateStore
> -----------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-22707
> URL: https://issues.apache.org/jira/browse/HBASE-22707
> Project: HBase
> Issue Type: Task
> Components: hbck2, master
> Affects Versions: 2.2.0, 2.3.0, 2.1.5
> Reporter: Wellington Chevreuil
> Assignee: Wellington Chevreuil
> Priority: Major
> Fix For: 2.3.0
>
> Attachments: HBASE-22707.branch-2.001.patch
>
>
> Although HBCK2 related, this is a master side improvement. On situations
> where regions are missing in META, any online fix tool such as the one being
> implemented in HBASE-22567 would require a further master restart to get
> RegionsStateStore reloaded from META, so that master can be aware of the
> newly re-added regions.
> After regions are re-added to meta in CLOSED state, it should be possible to
> bring those by simply invoking hbck2 _assigns_ command. But before
> _MasterRpcServices.assigns_ submits an _Assign_ procedure, it validates first
> if the given region is available on _AssignmentManager.RegionsStateStore_.
> The current patch reloads meta on _MasterRpcServices.assigns_ if the given
> region is not found on the first lookup, then try a new lookup again before
> giving-up on region assignment.
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