Gary Helmling created HDFS-9700:
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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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