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From Arun Ramakrishnan <aramakrish...@languageweaver.com>
Subject hbase restart after hdfs reconfig Issues
Date Sat, 10 Jul 2010 01:31:37 GMT
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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