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  1. Core Server
  2. SERVER-20639

Stage $sample requires sort option allowDiskUse:true

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    • Type: Icon: Bug Bug
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
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    • Affects Version/s: 3.1.8
    • Component/s: Aggregation Framework
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    • Fully Compatible
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      Just tried to run 

      { aggregate: "bigarray", pipeline: [ { $sample: { size: 1000 } } ], cursor: {} }

      and got error:

      Sort exceeded memory limit of 104857600 bytes, but did not opt in to external sorting. Aborting operation. Pass allowDiskUse:true to opt in.

      It's not clear why aggregation sorting is involved in $sample - if that's expected it needs to be prominently documented, but if it shouldn't be using sort then this is a bug.

            Assignee:
            Unassigned Unassigned
            Reporter:
            asya.kamsky@mongodb.com Asya Kamsky
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