Uploaded image for project: 'Hadoop Common'
  1. Hadoop Common
  2. HADOOP-2172

PositionCache was removed from FSDataInputStream, causes extremely bad MapFile performance

    XMLWordPrintableJSON

    Details

    • Type: Bug
    • Status: Closed
    • Priority: Blocker
    • Resolution: Fixed
    • Affects Version/s: 0.14.3, 0.15.0
    • Fix Version/s: 0.15.1
    • Component/s: fs
    • Labels:
      None

      Description

      The PositionCache in FSDataInputStream seems to have been removed in HADOOP-1470. This causes for example MapFile.get usage to be extremely slow as the file position isn't cached in memory.

        Attachments

        1. HADOOP-2172-4.patch
          2 kB
          Doug Cutting
        2. HADOOP-2172-2.patch
          2 kB
          Doug Cutting
        3. HADOOP-2172-3.patch
          6 kB
          Raghu Angadi
        4. HADOOP-2172-2.patch
          2 kB
          Doug Cutting
        5. positioncache-v1.patch
          5 kB
          Johan Oskarsson

          Activity

            People

            • Assignee:
              cutting Doug Cutting
              Reporter:
              johanoskarsson Johan Oskarsson
            • Votes:
              1 Vote for this issue
              Watchers:
              1 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: