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From Pavan Sudheendra <pavan0...@gmail.com>
Subject Zookeeper : Hconnection Received unexpected KeeperException
Date Sun, 25 Aug 2013 01:07:56 GMT
This was the Namenode log generated while running MR applications.. What do
they indicate where the problem is?


    2013-08-25 00:53:11,840 ERROR
>> org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper: ZooKeeper exists
>> failed after 3 retries
>>     2013-08-25 00:53:11,841 ERROR
>> org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher: hconnection Received
>> unexpected KeeperException, re-throwing exception
>>
>>
>>
>>     2013-08-25 00:57:52,595 ERROR
>> org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher: hconnection Received
>> unexpected KeeperException, re-throwing exception
>>     org.apache.zookeeper.KeeperException$ConnectionLossException:
>> KeeperErrorCode = ConnectionLoss for /hbase
>>     at
>> org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
>>     at
>> org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
>>     at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1041)
>>     at
>> org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.exists(RecoverableZooKeeper.java:172)
>>     at
>> org.apache.hadoop.hbase.zookeeper.ZKUtil.checkExists(ZKUtil.java:450)
>>     at
>> org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker.checkIfBaseNodeAvailable(ZooKeeperNodeTracker.java:208)
>>     at
>> org.apache.hadoop.hbase.zookeeper.RootRegionTracker.waitRootRegionLocation(RootRegionTracker.java:77)
>>     at
>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:874)
>>     at
>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:987)
>>     at
>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:885)
>>     at
>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:987)
>>     at
>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:889)
>>     at
>> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:846)
>>     at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:271)
>>     at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:211)
>>     at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:170)
>>     at
>> com.cisco.spvtg.corona.audience.profiling.actiondatainterpret.ActionDataInterpret$AnalyzeReducerTable.reduce(ActionDataInterpret.java:268)
>>     at
>> com.company.ActionDataInterpret$AnalyzeReducerTable.reduce(ActionDataInterpret.java:243)
>>     at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:164)
>>     at
>> org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:610)
>>     at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:444)
>>     at org.apache.hadoop.mapred.Child$4.run(Child.java:268)
>>     at java.security.AccessController.doPrivileged(Native Method)
>>     at javax.security.auth.Subject.doAs(Subject.java:396)
>>     at
>> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1408)
>>
>
-- 
Regards-
Pavan

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