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Posted to hdfs-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2010/03/12 00:30:27 UTC

[jira] Created: (HDFS-1037) DataXceiver client should use TCP_NODELAY

DataXceiver client should use TCP_NODELAY
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                 Key: HDFS-1037
                 URL: https://issues.apache.org/jira/browse/HDFS-1037
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs client
    Affects Versions: 0.22.0
            Reporter: Todd Lipcon


When the BlockReader connects to the DataXceiver and sends OP_READ_BLOCK, it doesn't set TCP_NODELAY to true first. This means that the OS will wait some number of ms to try to bundle further writes into the same TCP packet. Since we are only writing a small amount, and we already use a buffer, we can safely turn on NODELAY to avoid the nagling delay, potentially improving random read performance.

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