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I am trying to install Hadoop 2.2.0 in pseudo-distributed mode. While I am trying to start the datanode services it is showing the following error, can anyone please tell how to resolve this?
**2**014-03-11 08:48:15,916 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Block pool <registering> (storage id unknown) service to localhost/127.0.0.1:9000 starting to offer service 2014-03-11 08:48:15,922 INFO org.apache.hadoop.ipc.Server: IPC Server Responder: starting 2014-03-11 08:48:15,922 INFO org.apache.hadoop.ipc.Server: IPC Server listener on 50020: starting 2014-03-11 08:48:16,406 INFO org.apache.hadoop.hdfs.server.common.Storage: Lock on /home/prassanna/usr/local/hadoop/yarn_data/hdfs/datanode/in_use.lock acquired by nodename 3627@prassanna-Studio-1558 2014-03-11 08:48:16,426 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initialization failed for block pool Block pool BP-611836968-127.0.1.1-1394507838610 (storage id DS-1960076343-127.0.1.1-50010-1394127604582) service to localhost/127.0.0.1:9000 java.io.IOException: Incompatible clusterIDs in /home/prassanna/usr/local/hadoop/yarn_data/hdfs/datanode: namenode clusterID = CID-fb61aa70-4b15-470e-a1d0-12653e357a10; datanode clusterID = CID-8bf63244-0510-4db6-a949-8f74b50f2be9 at**** org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:391) at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:191) at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:219) at org.apache.hadoop.hdfs.server.datanode.DataNode.initStorage(DataNode.java:837) at org.apache.hadoop.hdfs.server.datanode.DataNode.initBlockPool(DataNode.java:808) at org.apache.hadoop.hdfs.server.datanode.BPOfferService.verifyAndSetNamespaceInfo(BPOfferService.java:280) at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.connectToNNAndHandshake(BPServiceActor.java:222) at org.apache.hadoop.hdfs.server.datanode.BPServiceActor.run(BPServiceActor.java:664) at java.lang.Thread.run(Thread.java:662) 2014-03-11 08:48:16,427 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Ending block pool service for: Block pool BP-611836968-127.0.1.1-1394507838610 (storage id DS-1960076343-127.0.1.1-50010-1394127604582) service to localhost/127.0.0.1:9000 2014-03-11 08:48:16,532 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Removed Block pool BP-611836968-127.0.1.1-1394507838610 (storage id DS-1960076343-127.0.1.1-50010-1394127604582) 2014-03-11 08:48:18,532 WARN org.apache.hadoop.hdfs.server.datanode.DataNode: Exiting Datanode 2014-03-11 08:48:18,534 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 0 2014-03-11 08:48:18,536 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG: 
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Datanode daemon should be started manually using $HADOOP_HOME/bin/hadoop-daemon.sh script. Master (NameNode) should correspondingly join the cluster after automatically contacted. New node should be added to the configuration/slaves file in the master server. New node will be identified by script-based commands.
As soon as the datanodes are declared dead. Data blocks on the failed Datanode are replicated on other Datanodes based on the specified replication factor in hdfs-site. xml file. Once the failed datanodes comes back the Name node will manage the replication factor again.
Start the DataNode on New NodeStart the datanode daemon manually using $HADOOP_HOME/bin/hadoop-daemon.sh script. It will automatically contact the master (NameNode) and join the cluster. We should also add the new node to the conf/slaves file in the master server. The script-based commands will recognize the new node.
DataNodes are the slave nodes in HDFS. The actual data is stored on DataNodes. A functional filesystem has more than one DataNode, with data replicated across them. On startup, a DataNode connects to the NameNode; spinning until that service comes up.
You can do the following method,
copy to clipboard datanode clusterID for your example, CID-8bf63244-0510-4db6-a949-8f74b50f2be9
and run following command under HADOOP_HOME/bin directory
./hdfs namenode -format -clusterId CID-8bf63244-0510-4db6-a949-8f74b50f2be9 then this code formatted the namenode with datanode cluster ids.
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You must do as follow :
bin/stop-all.sh rm -Rf /home/prassanna/usr/local/hadoop/yarn_data/hdfs/*bin/hadoop namenode -formatI had the same problem until I found an answer in this web site.
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