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https://issues.apache.org/jira/browse/HDFS-9805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15220852#comment-15220852
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Gary Helmling commented on HDFS-9805:
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[~cmccabe] I've updated the patch against the latest trunk. I can do a
branch-2.8 version as well if that helps. Please let me know what you think.
> TCP_NODELAY not set before SASL handshake in data transfer pipeline
> -------------------------------------------------------------------
>
> Key: HDFS-9805
> URL: https://issues.apache.org/jira/browse/HDFS-9805
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Gary Helmling
> Assignee: Gary Helmling
> Attachments: HDFS-9805.002.patch, HDFS-9805.003.patch
>
>
> There are a few places in the DN -> DN block transfer pipeline where
> TCP_NODELAY is not set before doing a SASL handshake:
> * in {{DataNode.DataTransfer::run()}}
> * in {{DataXceiver::replaceBlock()}}
> * in {{DataXceiver::writeBlock()}}
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