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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-19172) [rolling upgrade] Migrate region state from zk to hbase:meta
Date Fri, 03 Nov 2017 22:13:00 GMT
stack created HBASE-19172:
-----------------------------

             Summary: [rolling upgrade] Migrate region state from zk to hbase:meta
                 Key: HBASE-19172
                 URL: https://issues.apache.org/jira/browse/HBASE-19172
             Project: HBase
          Issue Type: Sub-task
            Reporter: stack
            Priority: Major
             Fix For: 2.0.0-beta-2


HBASE-19165 is about starting a branch-2 over branch-1 dataset. The Master when it comes up,
goes to read the 'state' of the region from hbase:meta because this is how region state is
kept now by AMv2 only, there is no state in hbase:meta on a fresh start. In hbase1, region
state was kept in master memory persisted to zk (rather than hbase:meta) while the region
was in transition.

We need to add to master a self-migration facility. If a region has no state in hbase:meta,
then look in zk to see if it RIT. If nothing in RIT, ask the pertinent regionserver if it
has the region.



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