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https://issues.apache.org/jira/browse/HDFS-5011?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713299#comment-13713299
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Kousuke Saruta commented on HDFS-5011:
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Sorry, I've written wrong comment.
the suffix is added in HADOOP-7771
> '._COPYING_' sufix temp file could prevent from running MapReduce job
> ----------------------------------------------------------------------
>
> Key: HDFS-5011
> URL: https://issues.apache.org/jira/browse/HDFS-5011
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.0.0
> Reporter: Kousuke Saruta
> Assignee: Kousuke Saruta
> Fix For: 3.0.0
>
>
> FsShell copy/put creates staging files with '._COPYING_' suffix.
> When we run MapReduce job during being the temp file, the job could fail
> because the temp file is not invisible from MapReduce job.
> Now, I suggest to rename the temp file with '_' suffix such like
> '_*._COPYING_'.
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