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Date: Mon, 5 Nov 2007 16:37:50 -0800 (PST)
From: "Jim Kellerman (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Commented: (HADOOP-2152) Data transfer buffer length in
 DFSOutputStream should not be user controlled.
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    [ https://issues.apache.org/jira/browse/HADOOP-2152?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12540315 ] 

Jim Kellerman commented on HADOOP-2152:
---------------------------------------

How does this issue relate to HADOOP-1707 which proposes elimination of client side caches?
In view of 1707, is this change still necessary?


> Data transfer buffer length in DFSOutputStream should not be user controlled.
> -----------------------------------------------------------------------------
>
>                 Key: HADOOP-2152
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2152
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.14.0
>            Reporter: Konstantin Shvachko
>             Fix For: 0.16.0
>
>
> DFSOutputStream has two distinct buffers. 
> First one is the user data buffer, which collects data the user writes into stream, 
> and flushes it into a temporary local file when the buffer is full.
> Second is the data transfer buffer, which is used to transfer data from the client to a data-node.
> It turns out to be that both buffers have the same length defined by the user when the file is created.
> I think the two buffer lengths should be completely independent.
> The user data buffer can still be controlled by the user, but the data transfer
> buffer should have independent length optimized for better transfer rate.

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