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Posted to hdfs-dev@hadoop.apache.org by "Jay Booth (JIRA)" <ji...@apache.org> on 2010/01/23 22:10:21 UTC

[jira] Created: (HDFS-918) Use single Selector and small thread pool to replace many instances of BlockSender for reads

Use single Selector and small thread pool to replace many instances of BlockSender for reads
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                 Key: HDFS-918
                 URL: https://issues.apache.org/jira/browse/HDFS-918
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: data-node
            Reporter: Jay Booth
             Fix For: 0.22.0


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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