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Posted to dev@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2017/11/03 22:13:00 UTC

[jira] [Created] (HBASE-19172) [rolling upgrade] Migrate region state from zk to hbase:meta

stack created HBASE-19172:
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             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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