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From Arun Ramakrishnan <aramakrish...@languageweaver.com>
Subject RE: hbase restart after hdfs reconfig Issues
Date Mon, 12 Jul 2010 17:24:49 GMT
Thanks for the explanation. After about a day, there are no more of these log messages. 


-----Original Message-----
From: jdcryans@gmail.com [mailto:jdcryans@gmail.com] On Behalf Of Jean-Daniel Cryans
Sent: Sunday, July 11, 2010 5:38 PM
To: user@hbase.apache.org
Subject: Re: hbase restart after hdfs reconfig Issues

This is all zookeeper logging, and although it's chatty I don't see
anything wrong in it (the NodeExists is normal since in 0.20 there are
some places that instead of checking for a znode existence, we try to
create it and only if it fails we update it). Also we log everything
that comes out of ZK.

J-D

On Fri, Jul 9, 2010 at 6:31 PM, Arun Ramakrishnan
<aramakrishnan@languageweaver.com> wrote:
> Hi Guys
>
> Some background if it might be helpful.
>  We have a 12 node cluster.  The following steps were taken to reconfigure the cluster.
>  I shutdown hbase. Removed 6 nodes from hdfs and added 4 new nodes. Ensured the all
the blocks were fully replicated ( thrice ).
>  Then, I restarted the hbase with edited region servers list ( old nodes removed ).
 I also changed the zookeeper quorum from 3 nodes to just 1.
>
> Here is some of the problems I am facing
>
> In the zookeeper log. I find tons and tons of these.
>
> ####################################
> 2010-07-09 18:22:16,956 WARN org.apache.zookeeper.server.PrepRequestProcessor: Got exception
when processing sessionid:0x129b9ae443a01bc type:create cxid:0x
> 3 zxid:0xfffffffffffffffe txntype:unknown n/a
> org.apache.zookeeper.KeeperException$NodeExistsException: KeeperErrorCode = NodeExists
>        at org.apache.zookeeper.server.PrepRequestProcessor.pRequest(PrepRequestProcessor.java:245)
>        at org.apache.zookeeper.server.PrepRequestProcessor.run(PrepRequestProcessor.java:114)
> 2010-07-09 18:22:17,207 INFO org.apache.zookeeper.server.NIOServerCnxn: Connected to
/192.168.130.92:44503 lastZxid 0
> 2010-07-09 18:22:17,207 INFO org.apache.zookeeper.server.NIOServerCnxn: Creating new
session 0x129b9ae443a01bd
> 2010-07-09 18:22:17,209 INFO org.apache.zookeeper.server.NIOServerCnxn: Finished init
of 0x129b9ae443a01bd valid:true
> 2010-07-09 18:22:17,458 INFO org.apache.zookeeper.server.PrepRequestProcessor: Processed
session termination request for id: 0x129b9ae443a01bc
> 2010-07-09 18:22:17,459 INFO org.apache.zookeeper.server.NIOServerCnxn: closing session:0x129b9ae443a01bc
NIOServerCnxn: java.nio.channels.SocketChannel[con
> nected local=/192.168.130.71:2181 remote=/192.168.130.92:43171]
> 2010-07-09 18:22:18,539 WARN org.apache.zookeeper.server.PrepRequestProcessor: Got exception
when processing sessionid:0x129b9ae443a01bd type:create cxid:0x
> 2 zxid:0xfffffffffffffffe txntype:unknown n/a
> #####################################
>
>
>
> Thanks
> Arun
>
>

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