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https://issues.apache.org/jira/browse/PIG-201?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Gates reassigned PIG-201:
------------------------------

    Assignee: Mathieu Poumeyrol

> BufferedPositionedInputStream is not buffered
> ---------------------------------------------
>
>                 Key: PIG-201
>                 URL: https://issues.apache.org/jira/browse/PIG-201
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Mathieu Poumeyrol
>            Assignee: Mathieu Poumeyrol
>         Attachments: BufferedPositionedInputStream.patch
>
>
> BufferedPositionedInputStream is actualy not buffered, leading (I guess) to 
> constant round trip to dfs as byte are read one by one. I just wrapped the 
> provided input stream in the constructor in a good old BufferedInputStream.
> I measured a 40% performance boost on a script that reads and writes 3.7GB in 
> dfs through PigStorage on one node. I guess the impact may be greater on a 
> real hdfs cluster with actual network roundtrips.
> FYI, the issue was found while profiling with Yourkit java profiler. Usefull 
> toy...

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