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From stack <st...@duboce.net>
Subject Re: Java client problem w/ zookeeper
Date Wed, 13 Jan 2010 22:54:37 GMT
I wonder what the 'node' is that its complaining about?  It doesn't say.  I
wonder if you did DEBUG for zk if you'd learn more?  Could enable it on the
problematic client only?


St.Ack

On Wed, Jan 13, 2010 at 11:25 AM, Adam Silberstein
<silberst@yahoo-inc.com>wrote:

> Hi,
> I set up a new Hbase cluster and am seeing an error I haven't seen before.
> When I start up Hbase I have this NodeExists error in the zookeeper log:
>
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode =
> NodeExists
>        at
>
> org.apache.zookeeper.server.PrepRequestProcessor.pRequest(PrepRequestProcess
> or.java:245)
>        at
>
> org.apache.zookeeper.server.PrepRequestProcessor.run(PrepRequestProcessor.ja
> va:114)
> 2010-01-13 11:10:47,503 WARN
> org.apache.zookeeper.server.PrepRequestProcessor: Got exception when
> processing sessionid:0x1262918396b0002 type:create cxid:0xc
> zxid:0xfffffffffffffffe txntype:unknown n/a
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode =
> NodeExists
>        at
>
> org.apache.zookeeper.server.PrepRequestProcessor.pRequest(PrepRequestProcess
> or.java:245)
>        at
>
> org.apache.zookeeper.server.PrepRequestProcessor.run(PrepRequestProcessor.ja
> va:114)
>
> I've read that may be harmless.  But then when I run the java client, it
> cannot do any operations.  And I see a similar NodeExists error in the
> zookeeper log.
>
>
> 2010-01-13 11:11:24,661 INFO org.apache.zookeeper.server.NIOServerCnxn:
> Connected to /203.104.21.210:36928 lastZxid 0
> 2010-01-13 11:11:24,661 INFO org.apache.zookeeper.server.NIOServerCnxn:
> Creating new session 0x1262918396b0004
> 2010-01-13 11:11:24,664 INFO org.apache.zookeeper.server.NIOServerCnxn:
> Finished init of 0x1262918396b0004 valid:true
> 2010-01-13 11:11:24,973 WARN
> org.apache.zookeeper.server.PrepRequestProcessor: Got exception when
> processing sessionid:0x1262918396b0004 type:create cxid:0x2
> zxid:0xfffffffffffffffe txntype:unknown n/a
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode =
> NodeExists
>        at
>
> org.apache.zookeeper.server.PrepRequestProcessor.pRequest(PrepRequestProcess
> or.java:245)
>        at
>
> org.apache.zookeeper.server.PrepRequestProcessor.run(PrepRequestProcessor.ja
> va:114)
> 2010-01-13 11:11:33,088 WARN org.apache.zookeeper.server.NIOServerCnxn:
> Exception causing close of session 0x1262918396b0004 due to
> java.io.IOException: Read error
> 2010-01-13 11:11:33,089 INFO org.apache.zookeeper.server.NIOServerCnxn:
> closing session:0x1262918396b0004 NIOServerCnxn:
> java.nio.channels.SocketChannel[connected local=/203.104.21.210:2181
> remote=/203.104.21.210:36928]
> 2010-01-13 11:11:42,709 INFO org.apache.zookeeper.server.NIOServerCnxn:
> Connected to /203.104.21.212:54837 lastZxid 0
> 2010-01-13 11:11:42,709 INFO org.apache.zookeeper.server.NIOServerCnxn:
> Creating new session 0x1262918396b0005
> 2010-01-13 11:11:42,711 INFO org.apache.zookeeper.server.NIOServerCnxn:
> Finished init of 0x1262918396b0005 valid:true
> 2010-01-13 11:11:42,711 WARN
> org.apache.zookeeper.server.PrepRequestProcessor: Got exception when
> processing sessionid:0x1262918396b0005 type:create cxid:0x1
> zxid:0xfffffffffffffffe txntype:unknown n/a
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode =
> NodeExists
>        at
>
> org.apache.zookeeper.server.PrepRequestProcessor.pRequest(PrepRequestProcess
> or.java:245)
>        at
>
> org.apache.zookeeper.server.PrepRequestProcessor.run(PrepRequestProcessor.ja
> va:114)
> 2010-01-13 11:12:06,002 INFO
> org.apache.zookeeper.server.SessionTrackerImpl:
> Expiring session 0x1262918396b0004
> 2010-01-13 11:12:06,002 INFO org.apache.zookeeper.server.ZooKeeperServer:
> Expiring session 0x1262918396b0004
> 2010-01-13 11:12:06,002 INFO
> org.apache.zookeeper.server.PrepRequestProcessor: Processed session
> termination request for id: 0x1262918396b0004
>
> I've tried wiping the whole setup, including the zookeeper files that Hbase
> puts in /tmp and formatting HDFS.  But I get the same problem again.  I'm
> not seeing any exceptions on the client-side.
>
> Thanks,
> Adam
>
>

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