[jira] [Created] (HBASE-22707) [HBCK2] MasterRpcServices assigns method should try to reload regions from meta if the passed regions isn't found under AssignmentManager RegionsStateStore

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

Wellington Chevreuil created HBASE-22707:
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             Summary: [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: 2.1.5, 2.2.0, 2.3.0
            Reporter: Wellington Chevreuil
            Assignee: Wellington Chevreuil
             Fix For: 2.3.0


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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