stack created HBASE-17642:
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Summary: [RSGROUP] Master hosting regions messes up rsgroup
calculation
Key: HBASE-17642
URL: https://issues.apache.org/jira/browse/HBASE-17642
Project: HBase
Issue Type: Bug
Components: Region Assignment, rsgroup
Affects Versions: 2.0.0
Reporter: stack
Priority: Blocker
In master branch, the Master poses as a RegionServer but it only carries
hbase:meta by default. This messes up rsgroup assignment checks and
calculations at an extreme when there is only one server in the default group
and this server is Master. A move of all servers but this 'fake' RegionServer
looks safe because there is a server to pick up all regions shed by the moved
servers.
All non-hbase:meta regions are dropped and put into the FAILED_OPEN state.
There are a few things up here.
* Master looks like a RegionServer in much of the system when we are asking
for the list of online servers but it is not a full-blown regionserver; the
balancer and/or AM are giving out misleading views on the cluster at least as
far as rsgroup is concernd.
* rsgroup shouldn't have to do assignment calculations; it should have API to
ask the AM to do it for it.
I'm filing this blocker and then putting it aside for now. AM is being redone
currently. Will come back when it has been rejiggered. At a minimum, can add
check to rsgroup but preferrably can add necessary API to AM for rsgroup to use.
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