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From "Christian Kunz (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HADOOP-2129) distcp between two clusters does not work if it is run on the target cluster
Date Tue, 06 Nov 2007 20:01:58 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2129?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christian Kunz reassigned HADOOP-2129:
--------------------------------------

    Assignee: Chris Douglas

> distcp between two clusters does not work if it is run on the target cluster
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-2129
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2129
>             Project: Hadoop
>          Issue Type: Bug
>          Components: util
>    Affects Versions: 0.16.0
>         Environment: Nightly build: http://hadoopqa.yst.corp.yahoo.com:8080/hudson/job/Hadoop-LinuxTest/718/
> With patches for HADOOP-2033 and HADOOP-2048.
>            Reporter: Murtaza A. Basrai
>            Assignee: Chris Douglas
>            Priority: Critical
>
> I am trying to copy a directory (~100k files, ~500GB) between two clusters A and B (~70
nodes), using a command like:
> hadoop distcp -log /logdir hdfs://namenode-of-A:8600/srcdir hdfs://namenode-of-B:8600/targetdir
> I tried 4 ways of doing it:
> 1) Copy from A to B, by running distcp on A
> 2) Copy from A to B, by running distcp on B
> 3) Copy from B to A, by running distcp on B
> 4) Copy from B to A, by running distcp on A
> Invocations 1 and 3 succeeded, but 2 and 4 failed.
> I got a lot of errors of the type below:
> 07/10/30 20:52:11 INFO mapred.JobClient: Running job: job_200710180049_0115
> 07/10/30 20:52:12 INFO mapred.JobClient:  map 0% reduce 0%
> 07/10/30 20:54:41 INFO mapred.JobClient:  map 1% reduce 0%
> 07/10/30 20:56:52 INFO mapred.JobClient:  map 2% reduce 0%
> 07/10/30 20:57:41 INFO mapred.JobClient: Task Id : task_200710180049_0115_m_000184_0,
Status : FAILED
> java.io.IOException: Some copies could not complete. See log for details.
>         at org.apache.hadoop.util.CopyFiles$FSCopyFilesMapper.close(CopyFiles.java:407)
>         at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:53)
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:192)
>         at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:1760)
> followed by the job failing:
> 07/10/30 22:07:41 INFO mapred.JobClient:  map 99% reduce 100%
> Copy failed: java.io.IOException: Job failed!
>         at org.apache.hadoop.mapred.JobClient.runJob(JobClient.java:688)
>         at org.apache.hadoop.util.CopyFiles.copy(CopyFiles.java:481)
>         at org.apache.hadoop.util.CopyFiles.run(CopyFiles.java:555)
>         at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:54)
>         at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:67)
>         at org.apache.hadoop.util.CopyFiles.main(CopyFiles.java:566)

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