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  1. Cassandra
  2. CASSANDRA-15387 Reduce compaction & local read path garbage
  3. CASSANDRA-15392

Pool Merge Iterators

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    Details

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

      By pooling merge iterators, instead of creating new ones each time we need them, we can reduce garbage on the compaction and read paths under relevant workloads by ~4% in many cases.

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          is depended upon by

          Improvement - An improvement or enhancement to an existing feature or task. CASSANDRA-15533 Don't allocate unneeded MergeIterator in OnDiskToken#iterator

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              • Assignee:
                bdeggleston Blake Eggleston
                Reporter:
                bdeggleston Blake Eggleston
                Authors:
                Blake Eggleston
                Reviewers:
                Benedict Elliott Smith, Jordan West
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                Dates

                • Created:
                  Updated: