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Posted to hdfs-issues@hadoop.apache.org by "Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org> on 2011/02/07 10:21:31 UTC

[jira] Commented: (HDFS-1601) Pipeline ACKs are sent as lots of tiny TCP packets

    [ https://issues.apache.org/jira/browse/HDFS-1601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991310#comment-12991310 ] 

Tsz Wo (Nicholas), SZE commented on HDFS-1601:
----------------------------------------------

It seems that using {{BufferedOutputStream}} is a better solution since it will also help other operations.

BTW, do you know why there are four one-byte packets?

> 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: 0.22.0
>
>
> 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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