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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-1707) Remove the DFS Client disk-based cache
Date Fri, 07 Dec 2007 08:32:43 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-1707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

dhruba borthakur updated HADOOP-1707:

    Attachment: clientDiskBuffer12.patch

Setting the TCP buffer size to 64K (instead of the default of 8K) and setting tcpNoDelay()
on the response socket improves performance by about 5%.

> Remove the DFS Client disk-based cache
> --------------------------------------
>                 Key: HADOOP-1707
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1707
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>             Fix For: 0.16.0
>         Attachments: clientDiskBuffer.patch, clientDiskBuffer10.patch, clientDiskBuffer11.patch,
clientDiskBuffer12.patch, clientDiskBuffer2.patch, clientDiskBuffer6.patch, clientDiskBuffer7.patch,
clientDiskBuffer8.patch, clientDiskBuffer9.patch, DataTransferProtocol.doc, DataTransferProtocol.html
> The DFS client currently uses a staging file on local disk to cache all user-writes to
a file. When the staging file accumulates 1 block worth of data, its contents are flushed
to a HDFS datanode. These operations occur sequentially.
> A simple optimization of allowing the user to write to another staging file while simultaneously
uploading the contents of the first staging file to HDFS will improve file-upload performance.

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