Uploaded image for project: 'Hadoop HDFS'
  1. Hadoop HDFS
  2. HDFS-7270

Add congestion signaling capability to DataNode write protocol

    XMLWordPrintableJSON

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.7.0
    • Component/s: datanode
    • Labels:
      None
    • Hadoop Flags:
      Reviewed
    • Release Note:
      Introduced a new configuration dfs.pipeline.ecn. When the configuration is turned on, DataNodes will signal in the writing pipelines when they are overloaded. The client can back off based on this congestion signal to avoid overloading the system.

      Description

      When a client writes to HDFS faster than the disk bandwidth of the DNs, it saturates the disk bandwidth and put the DNs unresponsive. The client only backs off by aborting / recovering the pipeline, which leads to failed writes and unnecessary pipeline recovery.

      This jira proposes to add explicit congestion control mechanisms in the writing pipeline.

        Attachments

        1. HDFS-7270.000.patch
          20 kB
          Haohui Mai
        2. HDFS-7270.001.patch
          20 kB
          Haohui Mai
        3. HDFS-7270.002.patch
          21 kB
          Haohui Mai
        4. HDFS-7270.003.patch
          19 kB
          Haohui Mai
        5. HDFS-7270.004.patch
          19 kB
          Haohui Mai

          Issue Links

            Activity

              People

              • Assignee:
                wheat9 Haohui Mai
                Reporter:
                wheat9 Haohui Mai
              • Votes:
                0 Vote for this issue
                Watchers:
                25 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: