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From "Martin Provencher (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAHOUT-646) Cannot run Wikipedia example on Amazon Elastic MapReduce (EMR)
Date Thu, 31 Mar 2011 18:20:05 GMT
Cannot run Wikipedia example on Amazon Elastic MapReduce (EMR)
--------------------------------------------------------------

                 Key: MAHOUT-646
                 URL: https://issues.apache.org/jira/browse/MAHOUT-646
             Project: Mahout
          Issue Type: Bug
          Components: Classification
    Affects Versions: 0.5
            Reporter: Martin Provencher
            Priority: Minor


When I tried to run the Wikipedia example on EMR with all the categories existing in the Wikipedia
dump, I got this error :

org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException:
failed to create file /yatter.tagger/wikipedia/input/_temporary/_attempt__0000_r_000000_0/part-r-00000
for DFSClient_attempt_201103292134_0010_r_000000_0 on client 10.240.10.157 because current
leaseholder is trying to recreate file.
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1045)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:981)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:377)
    at sun.reflect.GeneratedMethodAccessor7.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$Server.call(RPC.java:508)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:961)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:957)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:396)
    at org.apache.hadoop.ipc.Server$Handler.run(Server.java:955)

    at org.apache.hadoop.ipc.Client.call(Client.java:740)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)
    at $Proxy1.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:82)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
    at $Proxy1.create(Unknown Source)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.<init>(DFSClient.java:2709)
    at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:491)
    at org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:195)
    at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:524)
    at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:505)
    at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:412)
    at org.apache.hadoop.mapreduce.lib.output.TextOutputFormat.getRecordWriter(TextOutputFormat.java:128)
    at org.apache.mahout.classifier.bayes.MultipleTextOutputFormat.getBaseRecordWriter(MultipleTextOutputFormat.java:41)
    at org.apache.mahout.classifier.bayes.MultipleOutputFormat$1.write(MultipleOutputFormat.java:81)
    at org.apache.hadoop.mapred.ReduceTask$NewTrackingRecordWriter.write(ReduceTask.java:517)
    at org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80)
    at org.apache.mahout.classifier.bayes.WikipediaDatasetCreatorReducer.reduce(WikipediaDatasetCreatorReducer.java:35)
    at org.apache.mahout.classifier.bayes.WikipediaDatasetCreatorReducer.reduce(WikipediaDatasetCreatorReducer.java:28)
    at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
    at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:575)
    at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:412)
    at org.apache.hadoop.mapred.Child.main(Child.java:170)

org.apache.hadoop.ipc.RemoteException: java.io.IOException: failed to create file /yatter.tagger/wikipedia/input/_temporary/_attempt__0000_r_000000_0/part-r-00000
on client 10.240.10.157 either because the filename is invalid or the file exists
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1092)
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFile(FSNamesystem.java:981)
    at org.apache.hadoop.hdfs.server.namenode.NameNode.create(NameNode.java:377)
    at sun.reflect.GeneratedMethodAccessor7.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$Server.call(RPC.java:508)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:961)
    at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:957)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:396)
    at org.apache.hadoop.ipc.Server$Handler.run(Server.java:955)

    at org.apache.hadoop.ipc.Client.call(Client.java:740)
    at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:220)
    at $Proxy1.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:82)
    at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:59)
    at $Proxy1.create(Unknown Source)
    at org.apache.hadoop.hdfs.DFSClient$DFSOutputStream.<init>(DFSClient.java:2709)
    at org.apache.hadoop.hdfs.DFSClient.create(DFSClient.java:491)
    at org.apache.hadoop.hdfs.DistributedFileSystem.create(DistributedFileSystem.java:195)
    at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:524)
    at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:505)
    at org.apache.hadoop.fs.FileSystem.create(FileSystem.java:412)
    at org.apache.hadoop.mapreduce.lib.output.TextOutputFormat.getRecordWriter(TextOutputFormat.java:128)
    at org.apache.mahout.classifier.bayes.MultipleTextOutputFormat.getBaseRecordWriter(MultipleTextOutputFormat.java:41)
    at org.apache.mahout.classifier.bayes.MultipleOutputFormat$1.write(MultipleOutputFormat.java:81)
    at org.apache.hadoop.mapred.ReduceTask$NewTrackingRecordWriter.write(ReduceTask.java:517)
    at org.apache.hadoop.mapreduce.TaskInputOutputContext.write(TaskInputOutputContext.java:80)
    at org.apache.mahout.classifier.bayes.WikipediaDatasetCreatorReducer.reduce(WikipediaDatasetCreatorReducer.java:35)
    at org.apache.mahout.classifier.bayes.WikipediaDatasetCreatorReducer.reduce(WikipediaDatasetCreatorReducer.java:28)
    at org.apache.hadoop.mapreduce.Reducer.run(Reducer.java:176)
    at org.apache.hadoop.mapred.ReduceTask.runNewReducer(ReduceTask.java:575)
    at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:412)
    at org.apache.hadoop.mapred.Child.main(Child.java:170)

    4 more :
   org.apache.hadoop.ipc.RemoteException: java.io.IOException: failed to create file /yatter.tagger/wikipedia/input/_temporary/_attempt__0000_r_000000_0/part-r-00000
on client 10.240.10.157 either because the filename is invalid or the file exists

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