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https://issues.apache.org/jira/browse/HADOOP-3646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Abdul Qadeer updated HADOOP-3646:
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Attachment: bzip.patch
The patch is attached.
> Providing bzip2 as codec
> ------------------------
>
> Key: HADOOP-3646
> URL: https://issues.apache.org/jira/browse/HADOOP-3646
> Project: Hadoop Core
> Issue Type: Improvement
> Components: conf, io
> Affects Versions: 0.19.0
> Reporter: Abdul Qadeer
> Attachments: bzip.patch
>
> Original Estimate: 1008h
> Remaining Estimate: 1008h
>
> Hadoop recognizes gzip compressed input and automatically decompresses the
> data before providing it to the mapper. But Hadoop can not split a gzip
> stream due to the very nature of the gzip compression. Consequently one gzip
> stream (e.g a whole file) can go to only one mapper. On the contrary Bzip2
> compressed stream can be split across its block delimiters.
> We are interested in extending Hadoop to support splittable bzip2 with a
> codec. (https://issues.apache.org/jira/browse/HADOOP-1823 uses input reader
> to split the bzip2 files, which must be provided by the user and can handle
> FileInputFormat. If a user wants to use some other input format or wants to
> do custom record handling, he must write a new input reader!)
> We have a patch now that provides a basic bzip2 codec equivalent to the
> current gzip codec. We are in the process of extending that to support
> splitting.
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