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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-499) Avoid the use of Strings to improve the performance of hadoop streaming
Date Fri, 01 Sep 2006 20:51:23 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-499?page=all ]

Hairong Kuang updated HADOOP-499:
---------------------------------

    Attachment: text_streaming.patch

This patch includes the following fix:
1. replace the the use of UTF8 by Text in hadoop-streaming. Therefore, it fixesADOOP-413.
2. removes the use of stringsby adding simple manipulation of bytes arrays.
3. fix the stream close order when map/reduce finishes hence avoid truncated records.

> Avoid the use of Strings to improve the  performance of hadoop streaming
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-499
>                 URL: http://issues.apache.org/jira/browse/HADOOP-499
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: contrib/streaming
>    Affects Versions: 0.5.0
>            Reporter: Hairong Kuang
>         Assigned To: Hairong Kuang
>             Fix For: 0.6.0
>
>         Attachments: text_streaming.patch
>
>
> In hadoop streaming, a record is represented as a String for  I/O and is encoded as UTF8
for map/reduce. A record has to be converted between String and UTF8 back and forth multiple
times and  this wastes CPU time. 

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