Hadoop HDFS
  1. Hadoop HDFS
  2. HDFS-1601

Pipeline ACKs are sent as lots of tiny TCP packets

    Details

    • Type: Improvement Improvement
    • Status: Resolved
    • Priority: Major 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.

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

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            • Assignee:
              Todd Lipcon
              Reporter:
              Todd Lipcon
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              Dates

              • Created:
                Updated:
                Resolved:

                Development