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https://issues.apache.org/jira/browse/HBASE-19831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-19831:
--------------------------
Issue Type: Sub-task (was: Bug)
Parent: HBASE-19833
> Regions on the Master Redux
> ---------------------------
>
> Key: HBASE-19831
> URL: https://issues.apache.org/jira/browse/HBASE-19831
> Project: HBase
> Issue Type: Sub-task
> Reporter: stack
> Priority: Major
> 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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