Uploaded image for project: 'Hadoop HDFS'
  1. Hadoop HDFS
  2. HDFS-5182

BlockReaderLocal must allow zero-copy reads only when the DN believes it's valid

    XMLWordPrintableJSON

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major
    • Resolution: Fixed
    • Affects Version/s: 3.0.0-alpha1
    • Fix Version/s: 2.6.0
    • Component/s: hdfs-client
    • Labels:
      None
    • Target Version/s:

      Description

      BlockReaderLocal must allow zero-copy reads only when the DN believes it's valid. This implies adding a new field to the response to REQUEST_SHORT_CIRCUIT_FDS. We also need some kind of heartbeat from the client to the DN, so that the DN can inform the client when the mapped region is no longer locked into memory.

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                cmccabe Colin McCabe
                Reporter:
                cmccabe Colin McCabe
              • Votes:
                0 Vote for this issue
                Watchers:
                12 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved: