title: slaves datanodes are not located in master node storage
body: <p>Recently, i install hadoop multinode cluster on Ubuntu, everything is going, namenode and secondary node (its name HadoopMaster), all slaves are 2 (HadoopDataNode1,HadoopDataNode2)</p>
  
  <p>the problem when start-dfs.sh and start-yarn.sh script is executed, all slaves nodes are running its normal job "datanode and Nodemanager", all working fine, but the master node HadoopMaster when check the report, i get only one datanode which is the MasterNode datanode, but i did not found and DataNode from other datanodes .. all log files looking good, no exception </p>
  
  <p>the result from dfsadmin -report</p>
  
  <pre><code>Configured Capacity: 7791403008 (7.26 GB)
  Present Capacity: 1433530368 (1.34 GB)
  DFS Remaining: 1433505792 (1.34 GB)
  DFS Used: 24576 (24 KB)
  DFS Used%: 0.00%
  Under replicated blocks: 0
  Blocks with corrupt replicas: 0
  Missing blocks: 0
  -------------------------------------------------
  Datanodes available: 1 (1 total, 0 dead)
  Live datanodes:
  Name: 127.0.0.1:50010 (localhost)
  Hostname: HadoopMaster
  Decommission Status : Normal
  Configured Capacity: 7791403008 (7.26 GB)
  DFS Used: 24576 (24 KB)
  Non DFS Used: 6357872640 (5.92 GB)
  DFS Remaining: 1433505792 (1.34 GB)
  DFS Used%: 0.00%
  DFS Remaining%: 18.40%
  </code></pre>
  
  <p>i found in the logs of datanode that all datanodes are trying to connect to HadoopMaster:9000 and cannot connect</p>
  
  <pre><code>2014-09-16 04:06:32,721 INFO org.apache.hadoop.ipc.Client: 
  Retrying connect to server:        
  HadoopMaster/192.168.16.80:9000. Already tried 5 time(s); 
  retry policy is RetryUpToMaximumCountWithFixedSleep(maxRetries=10, sleepTime=1 SECONDS)
  </code></pre>
  
  <p>but the Namenode are working fine result of JPS on HadoopMaster namenode </p>
  
  <pre><code>21655 SecondaryNameNode
  22467 Jps
  21514 DataNode
  21376 NameNode
  21809 ResourceManager
  </code></pre>
  
  <p>and i checked if the port of HDFS is open </p>
  
  <pre><code>tcp        0      0 HadoopMaster:9000       *:*                     LISTEN    21376/java      
  </code></pre>
  
  <p>**all datanode accessible to the HadoopMaster vi SSH login passwordless</p>
  
  <p>any suggestion please .. </p>