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https://issues.apache.org/jira/browse/HDFS-9805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15214854#comment-15214854
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Colin Patrick McCabe commented on HDFS-9805:
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Hi [~ghelmling], thanks for looking at this. Can you update the patch?
> 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
>
> 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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