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Posted to hdfs-dev@hadoop.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2011/01/27 06:53:44 UTC

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

Pipeline ACKs are sent as lots of tiny TCP packets
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                 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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