Details

    • Type: Improvement
    • Status: Resolved
    • Priority: Low
    • Resolution: Fixed
    • Fix Version/s: 1.0.0
    • Component/s: None
    • Labels:

      Description

      In CASSANDRA-3104, this was removed with the following reasoning:

      compaction_throughput_mb_per_sec is a more effective throttle on compaction.

      This turns out to be false in the majority of deployments. In many (if not most) situations, compaction is actually CPU bound, not IO bound, so multithreaded compaction is generally helpful, but the priority needs to be lowered in order to prevent it from stealing CPU used for reads/writes.

      Compaction is always CPU bound on both real hardware (sw raid0 with two SATA disks) and on a rackspace cloud server (though my understanding is they are back by a raid10 array underneath) however I suspect even a single drive is fast enough to handle the ~20MB/s that compaction is currently performing when unthrottled.

        Attachments

        1. 3308.txt
          2 kB
          Jonathan Ellis

          Activity

            People

            • Assignee:
              jbellis Jonathan Ellis
              Reporter:
              brandon.williams Brandon Williams
              Authors:
              Jonathan Ellis
              Reviewers:
              Brandon Williams
            • Votes:
              1 Vote for this issue
              Watchers:
              1 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: