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  1. Core Server
  2. SERVER-12775

explain() performance degraded when all potential plans added to results

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      In a workload where explain() is called a lot I've lately seen a certain regression in throughput.
      I was able to isolate the commit that caused the problem.
      https://github.com/mongodb/mongo/commit/6dd40e54de4d62ed1c649f6f620a574e6de74fa8

      The throughput looks like 20% less and I'm completely able to recover if I revert to the previous revision. See screenshot attached.

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            david.storch@mongodb.com David Storch
            davide.italiano Davide Italiano
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