[jira] [Commented] (MAPREDUCE-2406) Failed validate copy in distcp

["Markus Jelsma (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13172226#comment-13172226 ] 

Markus Jelsma commented on MAPREDUCE-2406:
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I can confirm -pb solves this problem:
http://mail-archives.apache.org/mod_mbox/hadoop-hdfs-user/201112.mbox/%3C201112190922.39970.markus.jelsma@openindex.io%3E

During the first run many files fail. When i retry most files are skipped because they were already copied and a few files succeed. With a third try all files fail consistently. When i finally try again with -pb set all files are copied properly and thus solves this problem.
                
> Failed validate copy in distcp
> ------------------------------
>
>                 Key: MAPREDUCE-2406
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2406
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 0.21.0
>            Reporter: Rosie Li
>            Priority: Minor
>
> Each time the distcp is done, {{validateCopy(srcstat, absdst)}} will be called. 
> When doing distcp, if the -pb(preserve block size) is not set, the dst will use the default block size. However, if the src file use block size other than the default block size, and -pb is not set, after copying, the src and dst will have different block size. It will not pass the validateCopy check in this case.

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