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  1. Core Server
  2. SERVER-35419

Make diskRequirement in StageConstraints in DocumentSource reflect child pipeline requirements.

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    Details

    • Backwards Compatibility:
      Minor Change
    • Operating System:
      ALL
    • Backport Requested:
      v4.0
    • Epic Link:
    • Sprint:
      Query 2018-09-24

      Description

      Currently, if a stage (e.g. `$lookup`) has a "sub" pipeline that requires it to write persistent data, the stage's diskRequirement doesn't reflect that.

      Instead the parent stage should have the max diskRequirement of it's pipeline's stages under the total ordering

      kNoDiskUse < kWritesTmpData < kWritesPersistentData

      e.g. of the bug https://github.com/mongodb/mongo/blob/b93fe0e61bf7e8bc96da2edeb66afa1b915b0b77/src/mongo/db/pipeline/document_source_lookup.h#L100-L112

      https://github.com/mongodb/mongo/blob/b93fe0e61bf7e8bc96da2edeb66afa1b915b0b77/src/mongo/db/pipeline/document_source_facet.cpp#L232-L265 

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          has to be done after

          Bug - A problem which impairs or prevents the functions of the product. SERVER-34902 view definitions should *not* allow $out as a stage

          • Major - P3 - Major loss of function.
          • Closed
          is documented by

          Task - A task that needs to be done. DOCS-12086 Docs for SERVER-35419: Make diskRequirement in StageConstraints in DocumentSource reflect child pipeline requirements.

          • Major - P3 - Major loss of function.
          • Closed
          related to

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-36185 Allow specifying bypassDocumentValidation for each $out in an aggregation pipeline

          • Major - P3 - Major loss of function.
          • Open

          Improvement - An improvement or enhancement to an existing feature or task. SERVER-37140 Investigate what other StageConstraints are "inheritable"

          • Major - P3 - Major loss of function.
          • Closed

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                  Updated:
                  Resolved: