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From "Gary Helmling (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9805) TCP_NODELAY not set before SASL handshake in data transfer pipeline
Date Thu, 31 Mar 2016 23:25:25 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15220852#comment-15220852
] 

Gary Helmling commented on HDFS-9805:
-------------------------------------

[~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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