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  1. Core Server
  2. SERVER-32522

set_read_and_write_concerns.js treats mapReduce "out" field like aggregation's $out stage

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    • Fully Compatible
    • ALL
    • v3.6, v3.4, v3.2
    • TIG 2018-02-12
    • 0

    Description

      else if (cmdName === "mapReduce") {
      		 
          var stages = obj.pipeline;
      		 
          const lastStage = stages && Array.isArray(stages) && (stages.length !== 0)
      		 
              ? stages[stages.length - 1]
      		 
              : undefined;
      		 
          const hasOut =
      		 
              lastStage && (typeof lastStage === 'object') && lastStage.hasOwnProperty('$out');
      		 
          if (hasOut) {
      		 
              forceWriteConcern = true;
      		 
          }
      		 
      }

      https://github.com/mongodb/mongo/blob/276bc00ce7a5086a4524cf8d57c68a3ac5f32c8c/jstests/libs/override_methods/set_read_and_write_concerns.js#L156-L166

      It should instead check to see whether {out: {inline: 1}} was specified similar to what is being done in set_read_preference_secondary.js. We should also define some helper functions for determining whether the command object is (a) an "aggregate" command with a $out stage, or (b) a "mapReduce" (or "mapreduce") command with non-inline output to avoid duplicating logic across both set_read_and_write_concerns.js and set_read_preference_secondary.js.

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          is depended on by

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          • Critical - P2 - Crashes, loss of data, severe memory leak.
          • Closed
          is duplicated by

          Task - A task that needs to be done. SERVER-21012 Update read majority passthrough to override Mongo.prototype.runCommandWithMetadata

          • Minor - P4 - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          related to

          Bug - A problem which impairs or prevents the functions of the product. SERVER-60823 runCommandWithRetries in JS test framework exceeds JS interpreter recursion limit

          • Minor - P4 - Minor loss of function, or other problem where easy workaround is present.
          • Backlog

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              max.hirschhorn@mongodb.com Max Hirschhorn
              max.hirschhorn@mongodb.com Max Hirschhorn
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