Hi Ramesh,

Once restart your datanode (hadoop-daemon.sh start datanode) and send last 300 lines of datanode logs from $HADOOP_HOME/logs.

You also need to confirm whether your cluster IDs (/name/current/VERSION) for datanode and namenode is same.

Regards,
Sakhuja

Hello,

I also have same problem. My Datanode is not connecting to Namenode though my namenode and datanode is running fine. I have 3 node cluster (1 Namenode 2 Datanode). Datanode daemon start successfully but it is not showing in livenodes list in namenode webUI. Datanode logs continue showing these lines:

org.apache.hadoop.hdfs.server.datanode.DataNode: Problem connecting to server: master/172.16.30.159:9000

I have cross checked all configurations everytingh is fine.

If you find any solution to this please share...