Incompatible name space Id error.its because dat u might have formatted the namenode but data nodes folder is still have the same I'd.
What is the value of the following property dfs. Data.dir dfs. name.dir hadoop.tmp.dir The value of these properties is directory on local file system Solution is to open the version file of the name node (under dfs/name/current folder) you will see the first line as name space Id, copy that and then open version file of datanode which is not coming up (dfs/data/ current folder) you copy name space Id. Now start the data node process A dirty hack is to delete the folders(directories specified by the above properties) from all the machines and den format ur name node and start ur process. Please note dat the previous data will be lost On 25 Jan 2014 11:55, "Pranav Gadekar" <[email protected]> wrote: > This is my log file. > > 014-01-24 17:24:58,238 INFO > org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG: > /************************************************************ > STARTUP_MSG: Starting DataNode > STARTUP_MSG: host = user/127.0.1.1 > STARTUP_MSG: args = [] > STARTUP_MSG: version = 1.2.1 > STARTUP_MSG: build = > https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r > 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013 > STARTUP_MSG: java = 1.6.0_27 > ************************************************************/ > 2014-01-24 17:24:58,622 INFO > org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from > hadoop-metrics2.properties > 2014-01-24 17:24:58,669 INFO > org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source > MetricsSystem,sub=Stats registered. > 2014-01-24 17:24:58,670 INFO > org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot > period at 10 second(s). > 2014-01-24 17:24:58,670 INFO > org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system > started > 2014-01-24 17:24:58,877 INFO > org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi > registered. > 2014-01-24 17:24:58,880 WARN > org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Source name ugi already > exists! > 2014-01-24 17:25:10,778 ERROR > org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: > Incompatible namespaceIDs in /app/hadoop/tmp/dfs/data: namenode namespaceID > = 102782159; datanode namespaceID = 1227483104 > 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:414) > at > org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:321) > at > org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1712) > at > org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1651) > at > org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1669) > at > org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1795) > at > org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1812) > > 2014-01-24 17:25:10,779 INFO > org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG: > /************************************************************ > SHUTDOWN_MSG: Shutting down DataNode at user/127.0.1.1 > ************************************************************/ > 2014-01-24 17:26:13,413 INFO > org.apache.hadoop.hdfs.server.datanode.DataNode: STARTUP_MSG: > /************************************************************ > STARTUP_MSG: Starting DataNode > STARTUP_MSG: host = user/127.0.1.1 > STARTUP_MSG: args = [] > STARTUP_MSG: version = 1.2.1 > STARTUP_MSG: build = > https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r > 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013 > STARTUP_MSG: java = 1.6.0_27 > ************************************************************/ > 2014-01-24 17:26:13,510 INFO > org.apache.hadoop.metrics2.impl.MetricsConfig: loaded properties from > hadoop-metrics2.properties > 2014-01-24 17:26:13,518 INFO > org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source > MetricsSystem,sub=Stats registered. > 2014-01-24 17:26:13,518 INFO > org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Scheduled snapshot > period at 10 second(s). > 2014-01-24 17:26:13,518 INFO > org.apache.hadoop.metrics2.impl.MetricsSystemImpl: DataNode metrics system > started > 2014-01-24 17:26:13,626 INFO > org.apache.hadoop.metrics2.impl.MetricsSourceAdapter: MBean for source ugi > registered. > 2014-01-24 17:26:13,628 WARN > org.apache.hadoop.metrics2.impl.MetricsSystemImpl: Source name ugi already > exists! > 2014-01-24 17:26:28,860 ERROR > org.apache.hadoop.hdfs.server.datanode.DataNode: java.io.IOException: > Incompatible namespaceIDs in /app/hadoop/tmp/dfs/data: namenode namespaceID > = 102782159; datanode namespaceID = 1227483104 > 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:414) > at > org.apache.hadoop.hdfs.server.datanode.DataNode.<init>(DataNode.java:321) > at > org.apache.hadoop.hdfs.server.datanode.DataNode.makeInstance(DataNode.java:1712) > at > org.apache.hadoop.hdfs.server.datanode.DataNode.instantiateDataNode(DataNode.java:1651) > at > org.apache.hadoop.hdfs.server.datanode.DataNode.createDataNode(DataNode.java:1669) > at > org.apache.hadoop.hdfs.server.datanode.DataNode.secureMain(DataNode.java:1795) > at > org.apache.hadoop.hdfs.server.datanode.DataNode.main(DataNode.java:1812) > > 2014-01-24 17:26:28,860 INFO > org.apache.hadoop.hdfs.server.datanode.DataNode: SHUTDOWN_MSG: > /************************************************************ > SHUTDOWN_MSG: Shutting down DataNode at user/127.0.1.1 > ************************************************************/ > > > Shutdown command is initialised automatically. > Please take a look and respond with a solution. >
