Uploaded image for project: 'Cassandra'
  1. Cassandra
  2. CASSANDRA-15387 Reduce compaction & local read path garbage
  3. CASSANDRA-15393

Add byte array backed cells

    XMLWordPrintableJSON

    Details

    • Type: Sub-task
    • Status: Patch Available
    • Priority: Normal
    • Resolution: Unresolved
    • Fix Version/s: 4.0-beta
    • Component/s: Local/Compaction
    • Labels:
      None
    • Change Category:
      Performance
    • Complexity:
      Normal
    • Platform:
      All
    • Impacts:
      None
    • Test and Documentation Plan:
      Hide

      circle

      Show
      circle

      Description

      We currently materialize all values as on heap byte buffers. Byte buffers have a fairly high overhead given how frequently they’re used, and on the compaction and local read path we don’t do anything that needs them. Use of byte buffer methods only happens on the coordinator. Using cells that are backed by byte arrays instead in these situations reduces compaction and read garbage up to 22% in many cases.

        Attachments

          Issue Links

          Dependency

          Sub-task - The sub-task of the issue CASSANDRA-15391 Reduce heap footprint of commonly allocated objects

          • Normal -
          • Patch Available

            Activity

              People

              • Assignee:
                bdeggleston Blake Eggleston
                Reporter:
                bdeggleston Blake Eggleston
                Authors:
                Blake Eggleston
                Reviewers:
                Benedict Elliott Smith, Sam Tunnicliffe
              • Votes:
                0 Vote for this issue
                Watchers:
                4 Start watching this issue

                Dates

                • Created:
                  Updated: