I am trying to start the datanode on the slave node but when I check the dfs I only have one node.
When I check the logs on the slave node I find the following output. 2013-03-13 10:22:14,608 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG: /************************************************************ STARTUP_MSG: Starting DataNode STARTUP_MSG: host = Owner-5/127.0.1.1 STARTUP_MSG: args = [] STARTUP_MSG: version = 1.0.4 STARTUP_MSG: build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.0 -r 1393290; compiled by 'hortonfo' on Wed Oct 3 05:13:58 UTC 2012 ************************************************************/ 2013-03-13 10:22:15,086 INFO org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from hadoop-metrics2.properties 2013-03-13 10:22:15,121 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source MetricsSystem,sub=Stats registered. 2013-03-13 10:22:15,123 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot period at 10 second(s). 2013-03-13 10:22:15,123 INFO org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system started 2013-03-13 10:22:15,662 INFO org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi registered. 2013-03-13 10:22:15,686 WARN org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Source name ugi already exists! 2013-03-13 10:22:19,730 ERROR org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: Incompatible namespaceIDs in /home/hadoop/hdfs/data: namenode namespaceID = 1683708441; datanode namespaceID = 606666501 at org.apache.hadoop.hdfs.server.datanode.DataStorage.doTransition(DataStorage.java:232) at org.apache.hadoop.hdfs.server.datanode.DataStorage.recoverTransitionRead(DataStorage.java:147) at org.apache.hadoop.hdfs.server.datanode.DataNode.startDataNode(DataNode.java:385) at org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:299) at org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1582) at org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1521) at org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1539) at org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1665) at org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1682) 2013-03-13 10:22:19,731 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG: /************************************************************ SHUTDOWN_MSG: Shutting down DataNode at Owner-5/127.0.1.1 ************************************************************/ Thank you for any insights. Cyril
