ROOT not reassigned if only one regionserver left
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Key: HBASE-1908
URL: https://issues.apache.org/jira/browse/HBASE-1908
Project: Hadoop HBase
Issue Type: Bug
Affects Versions: 0.20.1
Reporter: Jonathan Gray
Priority: Blocker
Fix For: 0.20.2, 0.21.0
Yannis on the list uncovered an assignment bug:
{quote}
I performed additional testing with some alternate configurations and the
problem arises (ONLY) when there is only one regionserver left which has the
META table already assigned to it.
In this case the ROOT table does not get assigned to the last regionserver
(which holds the META table).
Interestingly enough though when there is only one regionserver left that has
the ROOT table already assign to it then it can also have the META table
re-assigned to it (if again is the only server - i.e. in this scenario you can
have one regionserver holding both the META and ROOT tables).
Unless I am missing something I cannot find any reason why we cannot assign the
ROOT table to the regionserver that manages the META table if it is the only
one remaining (again it is an extreme case I agree that this can happen).
I applied and tested a fix (at the hbase-0.20.0 codebase) in the
RegionManager::regionsAwaitingAssignment where I add the root table in the
regionstoAssign set if the it is the metaServer and also the only server.
{quote}
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