[ 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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