hadoop-pig-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (PIG-201) BufferedPositionedInputStream is not buffered
Date Mon, 26 Jan 2009 20:23:59 GMT

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

Olga Natkovich resolved PIG-201.

    Resolution: Fixed

we have added additional buffer and seeing much better performance now

> BufferedPositionedInputStream is not buffered
> ---------------------------------------------
>                 Key: PIG-201
>                 URL: https://issues.apache.org/jira/browse/PIG-201
>             Project: Pig
>          Issue Type: Bug
>            Reporter: 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...

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message