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https://issues.apache.org/jira/browse/HDFS-9805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15362983#comment-15362983
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Colin Patrick McCabe commented on HDFS-9805:
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Thanks for the reminder, [~jzhuge]. I committed the patch last week, but JIRA
went down before I could mark the ticket as resolved.
I have committed this to trunk only for the moment. The backport to branch-2
looks like it might be a little tricky, and our next release will be 3.0
anyway. If anyone is interested in backporting to branch-2, please do and
update the ticket. Cheers.
> 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
> Fix For: 3.0.0-alpha1
>
> Attachments: HDFS-9805.002.patch, HDFS-9805.003.patch,
> HDFS-9805.004.patch, HDFS-9805.005.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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