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  1. Couchbase Server
  2. MB-7522

Optimize very common index state transitions (rebalance)


    • Type: Improvement
    • Status: Resolved
    • Priority: Critical
    • Resolution: Fixed
    • Affects Version/s: 2.0.1
    • Fix Version/s: 2.0.1
    • Component/s: view-engine
    • Security Level: Public
    • Labels:
    • Flagged:
      Release Note


      Optimize 2 types of state transitions:

      1) If a state transition consists only of moving partitions
      between the passive and active states (or vice-versa), that
      is, no new partitions are added nor existing partitions are
      marked for cleanup, don't restart the updater (at the expense
      of more complex logic to correct snapshots received from a
      currently running updater).

      2) If a state transition only adds new partitions to the
      passive state (as ns_server's rebalance frequently calls),
      don't restart the updater, and send the updater the new
      list of passive partitions, so that it has a chance to
      iterate over those partitions' content and index them in
      the same run.

      As long as the rebalancer in ns_server doesn't keep changing
      its logic regarding state transitions all the time, this
      provides a significant reduction of the indexing time. However
      for at least some scenarios, there's still significant portion
      of rebalance time not spent on indexing nor index compaction.


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            • Assignee:
              FilipeManana Filipe Manana (Inactive)
              FilipeManana Filipe Manana (Inactive)
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              • Created:

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