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https://issues.apache.org/jira/browse/PIG-4533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14584614#comment-14584614
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Tomas Hudik commented on PIG-4533:
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My understanding is that these two issues are not related. This one is about
concatenated archives(gz/bz2), while that one is about a possible bug in tar.gz
> Document error: Pig does support concatenated gz file
> -----------------------------------------------------
>
> Key: PIG-4533
> URL: https://issues.apache.org/jira/browse/PIG-4533
> Project: Pig
> Issue Type: Bug
> Components: documentation, parser
> Reporter: Tomas Hudik
> Assignee: Daniel Dai
> Fix For: 0.16.0
>
> Attachments: PIG-4533-1.patch
>
>
> Documentation (since 0.11.1 at least) says :
> http://pig.apache.org/docs/r0.11.1/func.html#handling-compression
> _"Note: PigStorage and TextLoader correctly read compressed files as long as
> they are NOT CONCATENATED FILES generated in this manner: ..."_
> This is not true for tar.gz, since
> # I did a test - concatenated&compress some files and processed them. The
> same was done with the raw files (no compression). The results were identical
> # Jira's https://issues.apache.org/jira/i#browse/HADOOP-4012 and
> https://issues.apache.org/jira/i#browse/HADOOP-6835 says the concatenation
> problems were fixed in Hadoop 0.22, Hadoop 0.20 respectively. That said
> Hadoop (1 and 2) are supporting this already.
> Pig is handling tar.bz2 only (tar.gz is handled by hadoop-common).
> Therefore,
> # tar.bz2 should be handled by hadoop-common as well (there is no need to be
> handled by Pig anymore). (I believe
> https://github.com/apache/pig/tree/trunk/lib-src/bzip2/org/apache should be
> removed)
> # correct documentation accordingly (concatenated tar.gz, tar.bz2 are
> processing correctly)
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