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  1. Core Server
  2. SERVER-33683

Allow aggregation $mergeCursors stage to run inside a transaction

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Details

    • Improvement
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 4.1.7
    • Aggregation Framework, Sharding
    • None
    • Fully Compatible
    • Query 2018-12-03, Query 2018-12-17, Query 2018-12-31

    Description

      We banned aggregations within transactions on mongos as part of SERVER-33660, because doing so could potentially cause a deadlock. We should investigate how to perform a $mergeCursors against the same shard without inducing a deadlock. One idea is to avoid going over the network for a local cursor.

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          depends on

          Task - A task that needs to be done. SERVER-37665 Add interface to check in and check out sessions

          • Major - P3 - Major loss of function.
          • Closed
          is depended on by

          Task - A task that needs to be done. SERVER-37619 Make $out writes retryable

          • Major - P3 - Major loss of function.
          • Backlog
          is duplicated by

          Task - A task that needs to be done. SERVER-34015 Remove uasserts in cluster_aggregate that avoid running snapshot aggregate merge on mongod

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

          Bug - A problem which impairs or prevents the functions of the product. SERVER-33660 Once getMores include lsid, sharded aggregations with $mergeCursors can hang

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

          Task - A task that needs to be done. SERVER-33029 Support snapshot in cluster aggregate command

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

          Task - A task that needs to be done. SERVER-33541 Add snapshot read support for aggregation

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

          Bug - A problem which impairs or prevents the functions of the product. SERVER-37499 Potential deadlock when using exchange within a session

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

          Task - A task that needs to be done. SERVER-64407 Add ResourceYielder support to ARS

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

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            People

              ian.boros@mongodb.com Ian Boros
              charlie.swanson@mongodb.com Charlie Swanson
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              Dates

                Created:
                Updated:
                Resolved: