stack created HBASE-19831:
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Summary: Regions on the Master Redux
Key: HBASE-19831
URL: https://issues.apache.org/jira/browse/HBASE-19831
Project: HBase
Issue Type: Bug
Reporter: stack
Fix For: 3.0.0
HBASE-10569 made it so Master could host Regions. It was done a long time ago
(before hbase-1.0.0). This option was used in a few instances.
Come hbase-2.0.0, we've found that master-as-regionserver has problems. This is
an umbrella issue to address problems found. Meantime, master-as-regionserver
is broke.
In particular, the startup sequence needs redo – the bit where the Master
checks in as a RegionServer in time to be factored as a Server when the
balancer first runs. Then there is what to do about changing state in AMv2.
Region state is locked when changed. Currently it can involve an RPC to
hbase:meta. If problem contacting other Server, the lock on region state can
last a long time shutting out Master function. What should we do w/ backup
Masters? They should host regions too. And so on.
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