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Posted to issues@hbase.apache.org by "Cosmin Lehene (JIRA)" <ji...@apache.org> on 2010/06/15 21:25:24 UTC
[jira] Resolved: (HBASE-2731) HBase won't start due to
NodeExistsException in Zookeeper-based region assignment
[ https://issues.apache.org/jira/browse/HBASE-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Cosmin Lehene resolved HBASE-2731.
----------------------------------
Resolution: Invalid
The issue is invalid.
We had large date skew between servers and we run ntpdate to force the server time. This brought the current server time back and any updates were overshadowed by the "older" larger timestamp.
This made updates to both -ROOT- and .META. invisible and hence caused the described behavior.
> HBase won't start due to NodeExistsException in Zookeeper-based region assignment
> ---------------------------------------------------------------------------------
>
> Key: HBASE-2731
> URL: https://issues.apache.org/jira/browse/HBASE-2731
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.21.0
> Reporter: Cosmin Lehene
> Priority: Blocker
> Fix For: 0.21.0
>
>
> We're getting zillions of these in HMaster when it starts assigning regions at startup and it doesn't seem to progress.
> {code}
> 2010-06-15 06:30:00,287 WARN org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper:
> <org.apache.hadoop.hbase.master.HMaster>Failed to create ZNode /hbase/UNASSIGNED/1766164500 in ZooKeeper^D
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists for /hbase/UNASSIGNED/1766164500^D
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:110)^D
> at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)^D
> at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:637)^D
> at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.createZNodeIfNotExists(ZooKeeperWrapper.java:974)^D
> at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.createUnassignedRegion(ZooKeeperWrapper.java:1053)^D
> at org.apache.hadoop.hbase.master.RegionManager.doRegionAssignment(RegionManager.java:355)^D
> at org.apache.hadoop.hbase.master.RegionManager.assignRegions(RegionManager.java:312)^D
> at org.apache.hadoop.hbase.master.RegionManager.assignRegionsToMultipleServers(RegionManager.java:292)^D
> at org.apache.hadoop.hbase.master.RegionManager.assignRegions(RegionManager.java:221)^D
> at org.apache.hadoop.hbase.master.ServerManager.processMsgs(ServerManager.java:500)^D
> at org.apache.hadoop.hbase.master.ServerManager.processRegionServerAllsWell(ServerManager.java:425)^D
> at org.apache.hadoop.hbase.master.ServerManager.regionServerReport(ServerManager.java:335)^D
> at org.apache.hadoop.hbase.master.HMaster.regionServerReport(HMaster.java:700)^D
> at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)^D
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)^D
> at java.lang.reflect.Method.invoke(Method.java:597)^D
> at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:576)^D
> at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:919)
> {code}
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