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https://issues.apache.org/jira/browse/HDFS-9700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15145043#comment-15145043
]
Hudson commented on HDFS-9700:
------------------------------
FAILURE: Integrated in Hadoop-trunk-Commit #9294 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/9294/])
HDFS-9700. DFSClient and DFSOutputStream should set TCP_NODELAY on (iwasakims:
rev 372d1302c63c6f49f99be5766c5da9647ebd9ca6)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DataStreamer.java
*
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/impl/DfsClientConf.java
*
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DFSClient.java
*
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/client/HdfsClientConfigKeys.java
> DFSClient and DFSOutputStream should set TCP_NODELAY on sockets for
> DataTransferProtocol
> ----------------------------------------------------------------------------------------
>
> Key: HDFS-9700
> URL: https://issues.apache.org/jira/browse/HDFS-9700
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs-client
> Affects Versions: 2.7.1, 2.6.3
> Reporter: Gary Helmling
> Assignee: Gary Helmling
> Attachments: HDFS-9700-branch-2.7.002.patch,
> HDFS-9700-branch-2.7.003.patch, HDFS-9700-v1.patch, HDFS-9700-v2.patch,
> HDFS-9700.002.patch, HDFS-9700.003.patch, HDFS-9700.004.patch,
> HDFS-9700_branch-2.7-v2.patch, HDFS-9700_branch-2.7.patch
>
>
> 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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