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From "Konstantin Shvachko (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1601) Pipeline ACKs are sent as lots of tiny TCP packets
Date Tue, 13 Mar 2012 20:02:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228652#comment-13228652
] 

Konstantin Shvachko commented on HDFS-1601:
-------------------------------------------

Makes sense to have in 0.22. Patch looks good. Waiting for tests confirmation.
                
> 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-1601-22.txt, 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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