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Hbase cluster
Venkateswara Rao Dokku 2012-10-04, 13:08
Hi,
   I configured 2 node hbase cluster with hadoop-0.20.2 & hbase 0.92.1. The
installation went fine. One is the namenode & the other will act asa
datanode as well as region server, from the region server I couldn't access
HMaster. I was getting the following error when I try to scan the tables on
the namenode

hbase(main):001:0> list
TABLE
ERROR: org.apache.hadoop.hbase.MasterNotRunningException: Retried 7 times

Here is some help for this command:
List all tables in hbase. Optional regular expression parameter could
be used to filter the output. Examples:

  hbase> list
  hbase> list 'abc.*'

But when I see the processes running with jps command on name-node( master)
& datanode(slave) I got the following list
*namenode:*
*
*
6367 NameNode
6553 DataNode
7473 HMaster
7375 HQuorumPeer
6866 JobTracker
10391 Jps
6764 SecondaryNameNode
7041 TaskTracker

*datanode:*
*
*
15710 TaskTracker
15556 DataNode
13126 -- process information unavailable
19259 Jps
13218 NC
15874 HRegionServer

The following logs are logged into the hbase-region-server log file
2012-10-04 18:26:17,692 INFO
org.apache.hadoop.hbase.regionserver.HRegionServer: Attempting connect to
Master server at oc-PowerEdge-R610,60000,1349337115099
2012-10-04 18:27:18,491 WARN
org.apache.hadoop.hbase.regionserver.HRegionServer: Unable to connect to
master. Retrying. Error was:
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at
sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
        at
org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
        at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:404)
        at
org.apache.hadoop.hbase.ipc.HBaseClient$Connection.setupConnection(HBaseClient.java:328)
        at
org.apache.hadoop.hbase.ipc.HBaseClient$Connection.setupIOstreams(HBaseClient.java:362)
        at
org.apache.hadoop.hbase.ipc.HBaseClient.getConnection(HBaseClient.java:1045)
        at
org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:897)
        at
org.apache.hadoop.hbase.ipc.WritableRpcEngine$Invoker.invoke(WritableRpcEngine.java:150)
        at $Proxy7.getProtocolVersion(Unknown Source)
        at
org.apache.hadoop.hbase.ipc.WritableRpcEngine.getProxy(WritableRpcEngine.java:183)
        at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:303)
        at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:280)
        at org.apache.hadoop.hbase.ipc.HBaseRPC.getProxy(HBaseRPC.java:332)
        at
org.apache.hadoop.hbase.ipc.HBaseRPC.waitForProxy(HBaseRPC.java:236)
        at
org.apache.hadoop.hbase.regionserver.HRegionServer.getMaster(HRegionServer.java:1643)
        at
org.apache.hadoop.hbase.regionserver.HRegionServer.reportForDuty(HRegionServer.java:1680)
        at
org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:643)
        at java.lang.Thread.run(Thread.java:662)
I was struck here & couldn't get any help. Please help me out in rectifying
the error.
--
Thanks & Regards,
Venkateswara Rao Dokku,
Software Engineer,One Convergence Devices Pvt Ltd.,
Jubille Hills,Hyderabad.