Hello,
I am trying to set up Hadoop HDFS in a cluster for the first time. So far I was 
using pseudo-distributed mode on my PC at home and everything was working 
perfectly.
Tha NameNode starts but the DataNode doesn't start and the log contains the 
following:

2011-05-13 04:01:13,663 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: 
STARTUP_MSG: 
/************************************************************
STARTUP_MSG: Starting DataNode
STARTUP_MSG:   host = clone1/147.102.4.129
STARTUP_MSG:   args = []
STARTUP_MSG:   version = 0.20.2-cdh3u0
STARTUP_MSG:   build =  -r 81256ad0f2e4ab2bd34b04f53d25a6c23686dd14; compiled 
by 'hudson' on Fri Mar 25 19:56:23 PDT 2011
************************************************************/
2011-05-13 04:01:14,019 INFO org.apache.hadoop.security.UserGroupInformation: 
JAAS Configuration already set up for Hadoop, not re-installing.
2011-05-13 04:01:14,143 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: 
Registered FSDatasetStatusMBean
2011-05-13 04:01:14,152 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: 
Opened info server at 50010
2011-05-13 04:01:14,154 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: 
Balancing bandwith is 1048576 bytes/s
2011-05-13 04:01:14,206 INFO org.mortbay.log: Logging to 
org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog
2011-05-13 04:01:14,272 INFO org.apache.hadoop.http.HttpServer: Added global 
filtersafety (class=org.apache.hadoop.http.HttpServer$QuotingInputFilter)
2011-05-13 04:01:14,278 INFO org.apache.hadoop.http.HttpServer: Port returned 
by webServer.getConnectors()[0].getLocalPort() before open() is -1. Opening the 
listener on 50075
2011-05-13 04:01:14,278 INFO org.apache.hadoop.http.HttpServer: 
listener.getLocalPort() returned 50075 
webServer.getConnectors()[0].getLocalPort() returned 50075
2011-05-13 04:01:14,278 INFO org.apache.hadoop.http.HttpServer: Jetty bound to 
port 50075
2011-05-13 04:01:14,278 INFO org.mortbay.log: jetty-6.1.26
2011-05-13 04:01:14,567 INFO org.mortbay.log: Started 
SelectChannelConnector@0.0.0.0:50075
2011-05-13 04:01:14,570 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: 
Initializing JVM Metrics with processName=DataNode, sessionId=null
2011-05-13 04:01:14,976 INFO org.apache.hadoop.ipc.Server: Starting Socket 
Reader #1 for port 50020
2011-05-13 04:01:14,978 INFO org.apache.hadoop.ipc.metrics.RpcMetrics: 
Initializing RPC Metrics with hostName=DataNode, port=50020
2011-05-13 04:01:14,981 INFO org.apache.hadoop.ipc.metrics.RpcDetailedMetrics: 
Initializing RPC Metrics with hostName=DataNode, port=50020
2011-05-13 04:01:14,984 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: 
dnRegistration = DatanodeRegistration(clone1:50010, storageID=, infoPort=50075, 
ipcPort=50020)

Does anyone know what might be wrong??

Thank you in advance!
Panagiotis
                                          

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