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https://issues.apache.org/jira/browse/MAPREDUCE-5247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13688335#comment-13688335
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Kousuke Saruta commented on MAPREDUCE-5247:
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Stan, I think we should modify FsShell to create a file assigned the name with
underscore prefix for a file being created so that FileInputFormat can ignore
the file rather than modify FileInputFormat to handle a ._COPYING_ suffix file
as a hidden file.
It's just HDFS matter and I think the specification change shouldn't affects
MapReduce.
How do you think?
> FileInputFormat should filter files with '._COPYING_' sufix
> -----------------------------------------------------------
>
> Key: MAPREDUCE-5247
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5247
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Stan Rosenberg
>
> FsShell copy/put creates staging files with '._COPYING_' suffix. These files
> should be considered hidden by FileInputFormat. (A simple fix is to add the
> following conjunct to the existing hiddenFilter:
> {code}
> !name.endsWith("._COPYING_")
> {code}
> After upgrading to CDH 4.2.0 we encountered this bug. We have a legacy data
> loader which uses 'hadoop fs -put' to load data into hourly partitions. We
> also have intra-hourly jobs which are scheduled to execute several times per
> hour using the same hourly partition as input. Thus, as the new data is
> continuously loaded, these staging files (i.e., ._COPYING_) are breaking our
> jobs (since when copy/put completes staging files are moved).
> As a workaround, we've defined a custom input path filter and loaded it with
> "mapred.input.pathFilter.class".
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