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https://issues.apache.org/jira/browse/MAPREDUCE-469?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854201#action_12854201
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David Ciemiewicz commented on MAPREDUCE-469:
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bzip2 compression format also supports concatenation of individual bzip2
compressed files into a single file.
bzcat has absolutely no problem reading all of the data in one of these
concatenated files.
Unfortunately, both Hadoop Streaming and Pig only see about 2% of the data from
the original file in my case. That's a 98% effective data loss.
> Support concatenated gzip and bzip2 files
> -----------------------------------------
>
> Key: MAPREDUCE-469
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-469
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Reporter: Tom White
> Assignee: Ravi Gummadi
>
> When running MapReduce with concatenated gzip files as input only the first
> part is read, which is confusing, to say the least. Concatenated gzip is
> described in http://www.gnu.org/software/gzip/manual/gzip.html#Advanced-usage
> and in http://www.ietf.org/rfc/rfc1952.txt. (See original report at
> http://www.nabble.com/Problem-with-Hadoop-and-concatenated-gzip-files-to21383097.html)
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