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