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Posted to issues@hbase.apache.org by "Cosmin Lehene (JIRA)" <ji...@apache.org> on 2010/06/15 16:23:23 UTC

[jira] Created: (HBASE-2731) HBase won't start due to NodeExistsException in Zookeeper based region assignment

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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[jira] Commented: (HBASE-2731) HBase won't start due to NodeExistsException in Zookeeper-based region assignment

Posted by "stack (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HBASE-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12878986#action_12878986 ] 

stack commented on HBASE-2731:
------------------------------

This looks to be a by-product of HBASE-2694 Cosmin.

> 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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[jira] Updated: (HBASE-2731) HBase won't start due to NodeExistsException in Zookeeper-based region assignment

Posted by "Cosmin Lehene (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HBASE-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Cosmin Lehene updated HBASE-2731:
---------------------------------

    Summary: HBase won't start due to NodeExistsException in Zookeeper-based region assignment  (was: HBase won't start due to NodeExistsException in Zookeeper based region assignment)

> 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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[jira] Updated: (HBASE-2731) HBase won't start due to NodeExistsException in Zookeeper based region assignment

Posted by "Cosmin Lehene (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HBASE-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Cosmin Lehene updated HBASE-2731:
---------------------------------

    Description: 
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}

  was:
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}


> 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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[jira] Commented: (HBASE-2731) HBase won't start due to NodeExistsException in Zookeeper-based region assignment

Posted by "Jonathan Gray (JIRA)" <ji...@apache.org>.
    [ https://issues.apache.org/jira/browse/HBASE-2731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879023#action_12879023 ] 

Jonathan Gray commented on HBASE-2731:
--------------------------------------

@Cosmin, can you post full logs?  We've been doing cluster tests here so it does work in our environment.  Actually I wonder if we've tested cluster restart sufficiently...

> 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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[jira] Resolved: (HBASE-2731) HBase won't start due to NodeExistsException in Zookeeper-based region assignment

Posted by "Cosmin Lehene (JIRA)" <ji...@apache.org>.
     [ 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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