Wellington Chevreuil created HBASE-21843:
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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.
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