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From "Kousuke Saruta (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5247) FileInputFormat should filter files with '._COPYING_' sufix
Date Wed, 19 Jun 2013 19:17:20 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13688335#comment-13688335
] 

Kousuke Saruta commented on MAPREDUCE-5247:
-------------------------------------------

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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