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https://issues.apache.org/jira/browse/HBASE-2758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880882#action_12880882
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Jonathan Gray commented on HBASE-2758:
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I think Karthik has a fix for this in another patch. Basically, when a master
starts up (before we fully handle master failover) he just needs to clean out
all the znodes from /UNASSIGNED. Should be a simple fix.
> META region stuck in RS2ZK_REGION_OPENED state
> ----------------------------------------------
>
> Key: HBASE-2758
> URL: https://issues.apache.org/jira/browse/HBASE-2758
> Project: HBase
> Issue Type: Bug
> Components: master, regionserver
> Affects Versions: 0.21.0
> Reporter: Todd Lipcon
> Priority: Blocker
>
> In cluster testing trunk, I ended up with a situation where META was
> unassigned and no amount of restarting various pieces would fix it. On master
> startup, I see:
> 2010-06-20 21:08:05,431 DEBUG org.apache.hadoop.hbase.master.BaseScanner:
> Current assignment of .META.,,1.1028785192 is not valid; serverAddress=,
> startCode=0 unknown.
> 2010-06-20 21:08:05,436 DEBUG
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: While creating UNASSIGNED
> region 1028785192 exists, state = RS2ZK_REGION_OPENED
> 2010-06-20 21:08:05,438 WARN
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper:
> <monster01.sf.cloudera.com:/hbase,org.apache.hadoop.hbase.master.HMaster>Failed
> to create ZNode /hbase/UNASSIGNED/1028785192 in ZooKeeper
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode =
> NodeExists for /hbase/UNASSIGNED/1028785192
> 2010-06-20 21:08:05,438 DEBUG org.apache.hadoop.hbase.master.RegionManager:
> Created UNASSIGNED zNode .META.,,1.1028785192 in state M2ZK_REGION_OFFLINE
> then on the RS:
> 2010-06-20 21:08:05,899 ERROR
> org.apache.hadoop.hbase.regionserver.RSZookeeperUpdater: ZNode
> /hbase/UNASSIGNED/1028785192 is not in CLOSED/OFFLINE state (state =
> RS2ZK_REGION_OPENED), will NOT open region.
> 2010-06-20 21:08:05,899 ERROR
> org.apache.hadoop.hbase.regionserver.HRegionServer: Error opening
> .META.,,1.1028785192
> java.io.IOException: ZNode /hbase/UNASSIGNED/1028785192 is not in
> CLOSED/OFFLINE state (state = RS2ZK_REGION_OPENED), will NOT open region.
> and the region never opens
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