[jira] [Created] (HBASE-21843) AM misses region assignment in catastrophic scenarios where RS assigned to the region in Meta does not have a WAL dir.

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

Wellington Chevreuil created HBASE-21843:
--------------------------------------------

             Summary: AM misses region assignment in catastrophic scenarios where RS assigned to the region in Meta does not have a WAL dir.
                 Key: HBASE-21843
                 URL: https://issues.apache.org/jira/browse/HBASE-21843
             Project: HBase
          Issue Type: Task
            Reporter: Wellington Chevreuil
            Assignee: Wellington Chevreuil


A bit unusual, but managed to face this twice lately on both distributed and local standalone mode, on VMs. Somehow, after some VM pause/resume, got into a situation where regions on meta were assigned to a give RS startcode that had no corresponding WAL dir.

That caused those regions to never get assigned, because the given RS startcode is not found anywhere by RegionServerTracker/ServerManager, so no SCP is created to this RS startcode, leaving the region "open" on a dead server forever, in META.

Could get this sorted by adding extra check on loadMeta, checking if the RS assigned to the region in meta is not online and doesn't have a WAL dir, then mark this region as offline. 



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)