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From "Amareshwari Sriramadasu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-3429) Increase the buffersize for the streaming parent java process's streams
Date Fri, 23 May 2008 09:37:58 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3429?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Amareshwari Sriramadasu updated HADOOP-3429:
--------------------------------------------

    Attachment: patch-3429.txt

Here is a patch increasing the buffer size of streaming parent java process's streams.

This shows a significant improvement in maps. 
I ran a streaming app which consumes the input, but does output anything. The input size was
1.2GB
The running times of 10 runs of the streaming app with and without the patch are given below.
||With Patch || Without Patch ||
|2mins, 43sec | 6mins, 13sec|
|2mins, 48sec | 7mins, 24sec|
|2mins, 55sec | 6mins, 27sec|
|3mins, 24sec | 8mins, 33sec|
|2mins, 46sec | 7mins, 44sec|
|2mins, 47sec | 5mins, 37sec|
|2mins, 59sec | 5mins, 23sec|
|2mins, 53sec | 5mins, 4sec|
|3mins, 28sec | 5mins, 14sec|


> Increase the buffersize for the streaming parent java process's streams
> -----------------------------------------------------------------------
>
>                 Key: HADOOP-3429
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3429
>             Project: Hadoop Core
>          Issue Type: Improvement
>            Reporter: Devaraj Das
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.18.0
>
>         Attachments: patch-3429.txt
>
>
> We saw improved performance when we increased the buffersize for Pipes (HADOOP-1788).
In the streaming case, the buffersize is 8K (default for BufferedOutputStream). We should
set that to 128k.

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