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  1. Core Server
  2. SERVER-20445

Add support for majority read concern level to Aggregation $out

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Details

    • Improvement
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 4.1.6
    • Aggregation Framework, MapReduce
    • None
    • Fully Compatible
    • Query 2018-07-16, Query 2018-07-30, Query 2018-10-22, Query 2018-11-05, Query 2018-11-19

    Description

      For SERVER-20214 we are removing support for majority read concern level in these operations because we cannot write in that mode. This ticket is to reenable support.

      The current plan is to emulate majority read concern level by waiting for w:majority in the portions of those operations that write (aggregations including $out and all map reduces) and keep the read concern level for the portions that don't (aggregations not including $out including all work from the shard phase). It is unclear right now which category inline map reduce falls under. Part of this work is to ensure that this approach is valid.

      Attachments

        1. SERVER-20445.patch
          6 kB
        2. readMajorityOut.patch
          6 kB
        3. readMajorityOut.patch
          8 kB
        4. decipheredBt.txt
          7 kB
        5. decipheredBt.txt
          14 kB

        Issue Links

          is depended on by

          New Feature - A new feature of the product, which has yet to be developed. DRIVERS-610 Add support for majority read concern level to Aggregation $out

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

          Improvement - An improvement or enhancement to an existing feature or task. PHPLIB-290 Remove aggregate() and restriction on majority read concern

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

          Task - A task that needs to be done. DOCS-12598 Docs for SERVER-20445: Add support for majority read concern level to Aggregation $out

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

          New Feature - A new feature of the product, which has yet to be developed. DRIVERS-564 Add support for majority read concern level to MapReduce

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

          New Feature - A new feature of the product, which has yet to be developed. SERVER-36925 All write operations with a query component should support readConcern

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

          New Feature - A new feature of the product, which has yet to be developed. SERVER-38117 Add support for majority read concern level to MapReduce

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

          Task - A task that needs to be done. SERVER-20214 Stop supporting majority read concern level with MapReduce and Aggregation $out

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

          Task - A task that needs to be done. SERVER-36255 Prohibit $out with readConcern level "linearizable"

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

          Improvement - An improvement or enhancement to an existing feature or task. DOCS-10647 Document readConcern option for inline mapReduce

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

          Activity

            People

              martin.neupauer@mongodb.com Martin Neupauer
              mathias@mongodb.com Mathias Stearn
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              Dates

                Created:
                Updated:
                Resolved: