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  1. Core Server
  2. SERVER-36279

Change the explain format for sharded aggregations to accomodate $exchange

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    • Backwards Compatibility:
      Fully Compatible
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    • Sprint:
      Query 2018-09-10, Query 2018-09-24, Query 2018-10-08

      Description

      In a world where $exchange could be inserted theoretically anywhere in a sharded aggregation, it won't make sense to always present the "splitPipeline" in aggregation explain as a "shardsPart" and "mergerPart".

      One potential format is to break up the pipeline into "bubbles", where each one is separated by $exchange. At the exchange points, we could expose detail on which producers are feeding each consumer, to give a sense of how the routing is occurring.

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          depends on

          Task - A task that needs to be done. SERVER-35905 Plug pieces together to perform a distributed $exchange when applicable

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

          Task - A task that needs to be done. SERVER-44202 Complete TODO listed in SERVER-36279

          • Major - P3 - Major loss of function.
          • In Code Review

          Task - A task that needs to be done. SERVER-43429 Complete TODO listed in SERVER-36279

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

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