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Second node hdfs
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
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB