chunhui shen created HBASE-7506:
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Summary: Judgement of carrtying ROOT/META will become wrong when
expiring server
Key: HBASE-7506
URL: https://issues.apache.org/jira/browse/HBASE-7506
Project: HBase
Issue Type: Bug
Affects Versions: 0.94.3
Reporter: chunhui shen
Assignee: chunhui shen
Fix For: 0.96.0
We will check whether server carrying ROOT/META when expiring the server.
See ServerManager#expireServer.
If the dead server carrying META, we assign meta directly in the process of
ServerShutdownHandler.
If the dead server carrying ROOT, we will offline ROOT and then
verifyAndAssignRootWithRetries()
How judgement of carrtying ROOT/META become wrong?
If region is in RIT, and isCarryingRegion() return true after addressing from
zk.
However, once RIT time out(could be caused by this.allRegionServersOffline &&
!noRSAvailable, see AssignmentManager#TimeoutMonitor) and we assign it to
otherwhere, this judgement become wrong.
See AssignmentManager#isCarryingRegion for details
With the wrong judgement of carrtying ROOT/META, we would assign ROOT/META
twice.
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