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From "Kousuke Saruta (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5247) FileInputFormat should filter files with '._COPYING_' sufix
Date Sat, 22 Jun 2013 01:35:20 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13691008#comment-13691008
] 

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

As Devaraj said, we can use "mapred.input.pathFilter.class" but, as far as I know, the name
of the temporary file is undocumented and I think changes of the specification or implementation
of HDFS should not affect users who have ever used HDFS.
So, I think we should consider the name of the temporary file. It may good that the name of
the temporary file starts with "." or "_".

                
> 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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