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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2050) distcp failed due to problem in creating files
Date Mon, 22 Oct 2007 19:58:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12536812
] 

dhruba borthakur commented on HADOOP-2050:
------------------------------------------

Hi Runping, 

You said that "this problem happened in the 2nd, 3rd, 4th attempts, after the first attempt
failed." Can you pl look at the logs and verify that the timestamp between the 2nd, 3rd and
4th attempts were 1 minute apart? This information would help us figure out whether the bug
is in the client or the server.

> distcp failed due to problem in creating files
> ----------------------------------------------
>
>                 Key: HADOOP-2050
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2050
>             Project: Hadoop
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.15.0
>            Reporter: Runping Qi
>
> When I run a distcp program to copy files from one dfs to another, my job failed with
> the mappers throwing the following exception:
> org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.dfs.AlreadyBeingCreatedException:
failed to create file /xxxxx/part-00007 for DFSClient_task_200710122302_0002_m_000456_2 on
client 72.30.43.23 because current leaseholder is trying to recreate file.
> 	at org.apache.hadoop.dfs.FSNamesystem.startFileInternal(FSNamesystem.java:850)
> 	at org.apache.hadoop.dfs.FSNamesystem.startFile(FSNamesystem.java:806)
> 	at org.apache.hadoop.dfs.NameNode.create(NameNode.java:333)
> 	at sun.reflect.GeneratedMethodAccessor13.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$Server.call(RPC.java:379)
> 	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:596)
> 	at org.apache.hadoop.ipc.Client.call(Client.java:482)
> 	at org.apache.hadoop.ipc.RPC$Invoker.invoke(RPC.java:184)
> 	at org.apache.hadoop.dfs.$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 org.apache.hadoop.dfs.$Proxy1.create(Unknown Source)
> 	at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.(DFSClient.java:1432)
> 	at org.apache.hadoop.dfs.DFSClient.create(DFSClient.java:376)
> 	at org.apache.hadoop.dfs.DistributedFileSystem.create(DistributedFileSystem.java:121)
> 	at org.apache.hadoop.util.CopyFiles$FSCopyFilesMapper.copy(CopyFiles.java:284)
> 	at org.apache.hadoop.util.CopyFiles$FSCopyFilesMapper.map(CopyFiles.java:352)
> 	at org.apache.hadoop.util.CopyFiles$FSCopyFilesMapper.map(CopyFiles.java:217)
> 	at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:50)
> 	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:195)
> 	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1750)
> It seems that this problem happened  in the 2nd, 3rd, 4th attempts,
> after the first attemp failed.

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