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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-9700) DFSClient and DFSOutputStream do not respect TCP_NODELAY config in two spots
Date Mon, 25 Jan 2016 20:30:39 GMT
Gary Helmling created HDFS-9700:
-----------------------------------

             Summary: DFSClient and DFSOutputStream do not respect TCP_NODELAY config in two
spots
                 Key: HDFS-9700
                 URL: https://issues.apache.org/jira/browse/HDFS-9700
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: hdfs-client
    Affects Versions: 2.6.3, 2.7.1
            Reporter: Gary Helmling


In {{DFSClient.connectToDN()}} and {{DFSOutputStream.createSocketForPipeline()}}, we never
call {{setTcpNoDelay()}} on the constructed socket before sending.  In both cases, we should
respect the value of ipc.client.tcpnodelay in the configuration.

While this applies whether security is enabled or not, it seems to have a bigger impact on
latency when security is enabled.



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