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  1. Core Server
  2. SERVER-14496

Add limit parameter to $or operator to provide control of the number of queries that will be executed in parallel

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Details

    • Improvement
    • Status: Closed
    • Major - P3
    • Resolution: Works as Designed
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    • Querying
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    Description

      Decide whether or not this is necessary and if it is then implement.

      The current $or operator behaviour executes all clauses of an $or in parallel. The default behaviour should remain unchanged, however is it possible to add a control to limit the number of parallel queries (individual $or clauses executed) launched. With a poorly designed query this can cause performance issues at the mongod level and at a sharded level can trigger timeouts from the mongos processes.

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              ramon.fernandez@mongodb.com Ramon Fernandez Marina
              eoin.brazil@mongodb.com Eoin Brazil
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                Updated:
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