Are you using the MultipleOutputs class shipped with Apache Hadoop or one of your own?
If its the latter, please take a look at gotchas to take care of described at http://wiki.apache.org/hadoop/FAQ#Can_I_write_create.2Fwrite-to_hdfs_files_directly_from_map.2Freduce_tasks.3F On Mon, Dec 30, 2013 at 4:22 PM, AnilKumar B <akumarb2...@gmail.com> wrote: > Hi, > > I am using multiple outputs in our job. So whenever any reduce task fails, > all it's next task attempts are failing with file exist exception. > > > The output file name should also append the task attempt right? But it's > only appending the task id. Is this the bug or Some thing wrong from my > side? > > Where should look in src code? I went through code at > FileOutputFormat$getTaskOutputPath(), but there it's only considering task > id. > > > Exception Trace: > 13/12/29 09:13:00 INFO mapred.JobClient: Task Id : > attempt_201312162255_60465_r_000008_0, Status : FAILED > 13/12/29 09:14:42 WARN mapred.JobClient: Error reading task > outputhttp://localhost:50050/tasklog?plaintext=true&attemptid=attempt_201312162255_60465_r_000008_0&filter=stdout > 13/12/29 09:14:42 WARN mapred.JobClient: Error reading task > outputhttp://localhost:50050/tasklog?plaintext=true&attemptid=attempt_201312162255_60465_r_000008_0&filter=stderr > 13/12/29 09:15:04 INFO mapred.JobClient: map 100% reduce 93% > 13/12/29 09:15:23 INFO mapred.JobClient: map 100% reduce 96% > 13/12/29 09:17:31 INFO mapred.JobClient: map 100% reduce 97% > 13/12/29 09:19:34 INFO mapred.JobClient: Task Id : > attempt_201312162255_60465_r_000008_1, Status : FAILED > org.apache.hadoop.ipc.RemoteException: java.io.IOException: failed to create > /x/y/z/2013/12/29/04/o_2013_12_29_03-r-00008.gz on client 10.103.10.31 > either because the filename is invalid or the file exists > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1672) > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:1599) > at > org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:732) > at > org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:711) > at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown > Source) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:587) > at > org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1448) > at > org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1444) > at java.security.AccessController.doPrivileged(Native > Method) > at javax.security.auth.Subject.doAs(Subject.java:396) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1232) > at > org.apache.hadoop.ipc.Server$Handler.run(Server.java:1442) > > at org.apache.hadoop.ipc.Client.call(Client.java:1118) > at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:229) > at $Proxy7.create(Unknown Source) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native > Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at > org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:85) > at > org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:62) > at $Proxy7.create(Unknown Source) > at > org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.<init>(DFSClient.java:3753) > at > org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:937) > at > org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:207) > at > org.apache.hadoop.fs.FileSystem.create(FileSystem.java:555) > at > org.apache.hadoop.fs.FileSystem.create(FileSystem.java:536) > at > org.apache.hadoop.fs.FileSystem.create(FileSystem.java:443) > at > org.apache.hadoop.mapreduce.lib.output.TextOutputFormat.getRecordWriter(TextOutputFormat.java:131) > at > org.apache.hadoop.mapreduce.lib.output.MultipleOutputs.getRecordWriter(MultipleOutputs.java:411) > at > org.apache.hadoop.mapreduce.lib.output.MultipleOutputs.write(MultipleOutputs.java:370) > at > com.team.hadoop.mapreduce1$Reducer1.reduce(MapReduce1.java:254) > at > com.team.hadoop.mapreduce1$Reducer1.reduce(MapReduce1.java::144) > at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:177) > at > org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:649) > at > org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:418) > at org.apache.hadoop.mapred.Child$4.run(Child.java:255) > at java.security.AccessController.doPrivileged(Native > Method) > at javax.security.auth.Subject.doAs(Subject.java:396) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1232) > at org.apache.hadoop.mapred.Child.main(Child.java:249) > > 13/12/29 09:19:35 WARN mapred.JobClient: Error reading task > outputhttp://localhost:50050/tasklog?plaintext=true&attemptid=attempt_201312162255_60465_r_000008_1&filter=stdout > 13/12/29 09:19:35 WARN mapred.JobClient: Error reading task > outputhttp://localhost:50050/tasklog?plaintext=true&attemptid=attempt_201312162255_60465_r_000008_1&filter=stderr > 13/12/29 09:19:36 INFO mapred.JobClient: map 100% reduce 89% > 13/12/29 09:19:54 INFO mapred.JobClient: map 100% reduce 92% > 13/12/29 09:20:11 INFO mapred.JobClient: map 100% reduce 96% > 13/12/29 09:22:52 INFO mapred.JobClient: map 100% reduce 97% > 13/12/29 09:23:48 INFO mapred.JobClient: Task Id : > attempt_201312162255_60465_r_000008_2, Status : FAILED > org.apache.hadoop.ipc.RemoteException: java.io.IOException: failed to create > /x/y/z/2013/12/29/04/o_2013_12_29_03-r-00008.gz on client 10.103.7.33 either > because the filename is invalid or the file exists > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1672) > at > org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:1599) > at > org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:732) > at > org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:711) > at sun.reflect.GeneratedMethodAccessor14.invoke(Unknown > Source) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:587) > at > org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:1448) > > > Thanks & Regards, > B Anil Kumar. -- Harsh J
