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From Richard Tang <tristartom.t...@gmail.com>
Subject Re: Zookeeper have error msg "Session 0x0 for server null" when setting distributed hbase cluster
Date Tue, 18 Sep 2012 17:08:10 GMT
Hi Aleks, thanks for the notes. I have fixed the problem, which is I didnt
specify hbase.zookeeper.quorum explicitly in my setup. Once I fixed that,
hbase works well. (It looks in standalone mode, this property is not
mandatory...)
Regards,
Richard

On Tue, Sep 18, 2012 at 12:20 PM, Aleksandr Shulman <aleks@cloudera.com>wrote:

> Hi Richard,
>
> Are you running zookeeper-server? The default port on which ZK listens is
> 2181 and so it may also be worth doing a netstat -ap | grep 2181 to see if
> it is up.
>
> Can you also post your hbase-site.xml configs?
>
> Thanks,
>
> Aleks S.
> Cloudera
>
> On Tue, Sep 18, 2012 at 9:09 AM, Richard Tang <tristartom.tech@gmail.com
> >wrote:
>
> > Hi, All,
> > I have some problems in setting up distributed hbase cluster. My setup
> is a
> > 3-node hbase cluster, (node3 for hmaster and zk, and node4/5 for
> > regionservers). It is attached with a 3-node hdfs cluster (node 6 for
> > namenode, and node7/8 for datanodes). Passphrase-less ssh have been setup
> > from node3 to node4 (and from node3 to node5) and from node6 to node7
> (and
> > from node6 to node8).
> >
> > When I start hbase from node3, I have following error found in hbase log
> > files.
> >
> > @node3
> > 2012-09-18 08:23:11,523 INFO
> > org.apache.zookeeper.server.PrepRequestProcessor: Got user-level
> > KeeperException when processing sessionid:0x139d9c2d4a50000 type:create
> > cxid:0x8 zxid:0x1d3 txntype:-1 reqpath:n/a Error Path:/hbase/master
> > Error:KeeperErrorCode = NodeExists for /hbase/master
> >
> > @node4
> > 2012-09-18 08:23:27,328 WARN org.apache.zookeeper.ClientCnxn: Session 0x0
> > for server null, unexpected error, closing socket connection and
> attempting
> > reconnect
> > java.net.ConnectException: Connection refused
> >         at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
> >         at
> > sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:592)
> >         at
> >
> >
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:286)
> >         at
> > org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1035)
> > 2012-09-18 08:23:27,429 WARN
> > org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper: Possibly
> transient
> > ZooKeeper exception:
> > org.apache.zookeeper.KeeperException$ConnectionLossException:
> > KeeperErrorCode = ConnectionLoss for /hbase/master
> > 2012-09-18 08:23:27,429 ERROR
> > org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper: ZooKeeper exists
> > failed after 3 retries
> > 2012-09-18 08:23:27,429 WARN org.apache.hadoop.hbase.zookeeper.ZKUtil:
> > regionserver:60020 Unable to set watcher on znode /hbase/master
> > org.apache.zookeeper.KeeperException$ConnectionLossException:
> > KeeperErrorCode = ConnectionLoss for /hbase/master
> >         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:1021)
> >         at
> >
> >
> org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.exists(RecoverableZooKeeper.java:154)
> >         at
> >
> >
> org.apache.hadoop.hbase.zookeeper.ZKUtil.watchAndCheckExists(ZKUtil.java:226)
> >         at
> >
> >
> org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker.start(ZooKeeperNodeTracker.java:76)
> >         at
> >
> >
> org.apache.hadoop.hbase.regionserver.HRegionServer.initializeZooKeeper(HRegionServer.java:563)
> >         at
> >
> >
> org.apache.hadoop.hbase.regionserver.HRegionServer.preRegistrationInitialization(HRegionServer.java:532)
> >         at
> >
> >
> org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:634)
> >         at java.lang.Thread.run(Thread.java:679)
> >
> > I have managed to run hbase under single-node configuration (with the
> same
> > system setup), without problems. Please let me know the possible cause or
> > howto for approaching the problem cause.
> >
> > Regards,
> > Richard
> >
>
>
>
> --
> Best Regards,
>
> Aleks Shulman
> 847.814.5804
> Cloudera
>

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