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  1. Hadoop HDFS
  2. HDFS-1601

Pipeline ACKs are sent as lots of tiny TCP packets

    Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 0.22.0
    • Fix Version/s: 0.23.0, 0.22.1
    • Component/s: datanode
    • Labels:
      None
    • Hadoop Flags:
      Reviewed

      Description

      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.

        Attachments

        1. hdfs-1601-22.txt
          0.9 kB
          Mayank Bansal
        2. hdfs-1601.txt
          0.9 kB
          Todd Lipcon
        3. hdfs-1601.txt
          1 kB
          Todd Lipcon

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              • Assignee:
                tlipcon Todd Lipcon
                Reporter:
                tlipcon Todd Lipcon
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                • Created:
                  Updated:
                  Resolved: