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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9805) TCP_NODELAY not set before SASL handshake in data transfer pipeline
Date Tue, 05 Jul 2016 18:42:11 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15362983#comment-15362983

Colin Patrick McCabe commented on HDFS-9805:

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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