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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