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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-918) Use single Selector and small thread pool to replace many instances of BlockSender for reads
Date Mon, 06 Jun 2011 02:13:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044677#comment-13044677
] 

Todd Lipcon commented on HDFS-918:
----------------------------------

I rebased just the pooling part of the patch and posted at HDFS-1323

> Use single Selector and small thread pool to replace many instances of BlockSender for
reads
> --------------------------------------------------------------------------------------------
>
>                 Key: HDFS-918
>                 URL: https://issues.apache.org/jira/browse/HDFS-918
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>            Reporter: Jay Booth
>            Assignee: Jay Booth
>         Attachments: hbase-hdfs-benchmarks.ods, hdfs-918-20100201.patch, hdfs-918-20100203.patch,
hdfs-918-20100211.patch, hdfs-918-20100228.patch, hdfs-918-20100309.patch, hdfs-918-TRUNK.patch,
hdfs-918-branch20-append.patch, hdfs-918-branch20.2.patch, hdfs-918-pool.patch, hdfs-multiplex.patch
>
>
> Currently, on read requests, the DataXCeiver server allocates a new thread per request,
which must allocate its own buffers and leads to higher-than-optimal CPU and memory usage
by the sending threads.  If we had a single selector and a small threadpool to multiplex request
packets, we could theoretically achieve higher performance while taking up fewer resources
and leaving more CPU on datanodes available for mapred, hbase or whatever.  This can be done
without changing any wire protocols.

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