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.
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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
