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https://issues.apache.org/jira/browse/PIG-42?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12549494
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Benjamin Reed commented on PIG-42:
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The patch is not ready to commit yet. It's a work in progress patch. I talked
to Utkarash about this and it's missing a termination of the split. Currently
each split will not terminate correctly.There is a termination hook that bzip
uses that I need to latch into.
Basically here are the things I need to add to finish:
1) Terminate split processing correctly
2) Add test cases
3) Encode block size as part of the header so that we can get almost "perfect"
splits. (For example a file that is compressed as 128M blocks should not be
split on 64M boundaries even if the block size of the filesystem is 128M.)
I'll try to get a committable patch this weekend.
> Pig should be able to split Gzip files like it can split Bzip files
> -------------------------------------------------------------------
>
> Key: PIG-42
> URL: https://issues.apache.org/jira/browse/PIG-42
> Project: Pig
> Issue Type: Improvement
> Components: impl
> Reporter: Benjamin Reed
> Attachments: gzip.patch
>
>
> It would be nice to be able to split gzip files like we can split bzip files.
> Unfortunately, we don't have a sync point for the split in the gzip format.
> Gzip file format supports the notion of concatenate gzipped files. When
> gzipped files are concatenated together they are treated as a single file. So
> to make a gzipped file splittable we can used an empty compressed file with
> some salt in the headers as a sync signature. Then we can make the gzip file
> splittable by using this sync signature between compressed segments of the
> file.
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