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Posted to issues@hbase.apache.org by "Karthik Ranganathan (JIRA)" <ji...@apache.org> on 2010/06/23 05:08:51 UTC
[jira] Updated: (HBASE-2758) META region stuck in
RS2ZK_REGION_OPENED state
[ https://issues.apache.org/jira/browse/HBASE-2758?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Karthik Ranganathan updated HBASE-2758:
---------------------------------------
Attachment: HBASE-2758-0.21.patch
If the cluster was shutdown before the regions in transition in ZK was cleared, then it does not get assigned out on startup. Fix is to delete the UNASSIGNED znode in ZK on a new cluster start.
> 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
> Assignee: Karthik Ranganathan
> Priority: Blocker
> Attachments: HBASE-2758-0.21.patch
>
>
> 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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