[jira] Commented: (HADOOP-2379) Distcp setup is slow

["Doug Cutting (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-2379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12549515 ] 

Doug Cutting commented on HADOOP-2379:
--------------------------------------

This may be improved by HADOOP-2129, which improves the caching of FileStatus in DFS.  You might try applying that patch to 0.14.3...


> Distcp setup is slow
> --------------------
>
>                 Key: HADOOP-2379
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2379
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>    Affects Versions: 0.14.3
>         Environment: from 35 node cluster to 10 node cluster
>            Reporter: Johan Oskarsson
>            Priority: Minor
>
> When starting a distcp the setup phase often takes a very long time. For example during the distcp I just ran the setup phase took 15 minutes and the actual copy 3 minutes. Could this be improved? Or at least a progress bar added so the user doesn't think it stalled.
> I also often see exceptions like this in the setup, but the distcp finishes eventually.
> java.io.EOFException
>         at java.io.DataInputStream.readShort(DataInputStream.java:298)
>         at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.endBlock(DFSClient.java:1672)
>         at org.apache.hadoop.dfs.DFSClient$DFSOutputStream.close(DFSClient.java:1744)
>         at org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:49)
>         at org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:64)
>         at org.apache.hadoop.io.SequenceFile$Writer.close(SequenceFile.java:774)
>         at org.apache.hadoop.util.CopyFiles$FSCopyFilesMapper.setup(CopyFiles.java:351)
>         at org.apache.hadoop.util.CopyFiles.copy(CopyFiles.java:773)
>         at org.apache.hadoop.util.CopyFiles.run(CopyFiles.java:854)
>         at org.apache.hadoop.util.ToolBase.doMain(ToolBase.java:187)
>         at org.apache.hadoop.util.CopyFiles.main(CopyFiles.java:864)

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