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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1601) Pipeline ACKs are sent as lots of tiny TCP packets
Date Wed, 20 Apr 2011 23:33:10 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13022435#comment-13022435
] 

Hudson commented on HDFS-1601:
------------------------------

Integrated in Hadoop-Hdfs-trunk #643 (See [https://builds.apache.org/hudson/job/Hadoop-Hdfs-trunk/643/])
    

> Pipeline ACKs are sent as lots of tiny TCP packets
> --------------------------------------------------
>
>                 Key: HDFS-1601
>                 URL: https://issues.apache.org/jira/browse/HDFS-1601
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node
>    Affects Versions: 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>             Fix For: 0.23.0
>
>         Attachments: hdfs-1601.txt, hdfs-1601.txt
>
>
> I noticed in an hbase benchmark that the packet counts in my network monitoring seemed
high, so took a short pcap trace and found that each pipeline ACK was being sent as five packets,
the first four of which only contain one byte. We should buffer these bytes and send the PipelineAck
as one TCP packet.

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