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https://issues.apache.org/jira/browse/MAPREDUCE-469?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Greg Roelofs updated MAPREDUCE-469:
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Attachment: MR-469.v2.yahoo-0.20.2xx-branch.patch
Expanded test coverage uncovered a bug on Friday, and trunk update today has
breakage, so this version is against Yahoo's 0.20S+ branch.
Still not quite final; I haven't finished updating the unit test to exercise
both native and built-in gzip and built-in bzip2 at multiple buffer sizes, and
I've left some (mostly) commented-out debug statements in place in case that
turns up anything further.
Reviewer questions:
- Currently the new BuiltInGzipDecompressor class inherits directly from JDK
Inflater, but I suspect I should extend BuiltInZlibInflater instead.
- Is it worthwhile to encapsulate the state label and associated variables
into a private inner class (BuiltInGzipDecompressor.java, first FIXME comment)?
The other FIXMEs are either related to the two items above or else are largely
unrelated to this issue.
> 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: Greg Roelofs
> Attachments: grr-hadoop-common.dif.20100614c,
> grr-hadoop-mapreduce.dif.20100614c, MR-469.v2.yahoo-0.20.2xx-branch.patch
>
>
> 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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