Hi I just start to try out hadoop2.0, I use the 2.0.5-alpha package
And follow http://hadoop.apache.org/docs/r2.0.5-alpha/hadoop-project-dist/hadoop-common/ClusterSetup.html to setup a cluster in non-security mode. HDFS works fine with client tools. While when I run wordcount example, there are errors : ./bin/hadoop jar ./share/hadoop/mapreduce/hadoop-mapreduce-examples-2.0.5-alpha.jar wordcount /tmp /out 13/07/12 15:05:53 INFO mapreduce.Job: Task Id : attempt_1373609123233_0004_m_000004_0, Status : FAILED Error: java.io.FileNotFoundException: Path is not a file: /tmp/hadoop-yarn at org.apache.hadoop.hdfs.server.namenode.INodeFile.valueOf(INodeFile.java:42) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocationsUpdateTimes(FSNamesystem.java:1317) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocationsInt(FSNamesystem.java:1276) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocations(FSNamesystem.java:1252) at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocations(FSNamesystem.java:1225) at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getBlockLocations(NameNodeRpcServer.java:403) at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getBlockLocations(ClientNamenodeProtocolServerSideTranslatorPB.java:239) at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java:40728) at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:454) at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1014) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1741) at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1737) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478) at org.apache.hadoop.ipc.Server$Handler.run(Server.java:1735) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:525) at org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:90) at org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:57) at org.apache.hadoop.hdfs.DFSClient.callGetBlockLocations(DFSClient.java:986) at org.apache.hadoop.hdfs.DFSClient.getLocatedBlocks(DFSClient.java:974) at org.apache.hadoop.hdfs.DFSInputStream.fetchLocatedBlocksAndGetLastBlockLength(DFSInputStream.java:157) at org.apache.hadoop.hdfs.DFSInputStream.openInfo(DFSInputStream.java:124) at org.apache.hadoop.hdfs.DFSInputStream.<init>(DFSInputStream.java:117) at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:1131) at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:244) at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:77) at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:713) at org.apache.hadoop.mapreduce.lib.input.LineRecordReader.initialize(LineRecordReader.java:89) at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.initialize(MapTask.java:519) at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:756) at org.apache.hadoop.mapred.MapTask.run(MapTask.java:339) at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:158) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:415) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1478) at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:153) I check the HDFS and found /tmp/hadoop-yarn is there , this dir's owner is the same as the job user. And to ensure it works, I also create /tmp/hadoop-yarn on local fs. None of it works. Any idea what might be the problem? Thx! Best Regards, Raymond Liu
