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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2758) META region stuck in RS2ZK_REGION_OPENED state
Date Mon, 21 Jun 2010 16:30:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12880882#action_12880882

Jonathan Gray commented on HBASE-2758:

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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