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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