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https://issues.apache.org/jira/browse/HADOOP-3227?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Douglas reassigned HADOOP-3227:
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Assignee: zhuweimin
> Implement a binary input/output format for Streaming
> ----------------------------------------------------
>
> Key: HADOOP-3227
> URL: https://issues.apache.org/jira/browse/HADOOP-3227
> Project: Hadoop Core
> Issue Type: Improvement
> Components: contrib/streaming
> Affects Versions: 0.19.1
> Reporter: Arun C Murthy
> Assignee: zhuweimin
> Attachments: hadoop-3227.patch
>
>
> Lots of streaming applications process textual data with 1 record per line
> and fields separated by a delimiter. It turns out that there is no point in
> using any of Hadoop's input/output formats since the streaming script/binary
> itself will parse the input and break into records and fields. In such cases
> we should provide users with a binary input/output format which just sends
> 64k (or so) blocks of data directly from HDFS to the streaming application.
> I did something very similar for Pig-Streaming (PIG-94 - BinaryStorage) which
> resulted in 300%+ speedup for scanning (identity mapper & map-only jobs)
> data... the parsing done by input/output formats in these cases were
> pure-overhead.
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