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  1. Core Server
  2. SERVER-33683

Allow aggregation $mergeCursors stage to run inside a transaction

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    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 4.1.7
    • Component/s: Aggregation Framework, Sharding
    • Labels:
      None
    • Backwards Compatibility:
      Fully Compatible
    • Sprint:
      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.
          • Open
          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

            Activity

              People

              Assignee:
              ian.boros Ian Boros
              Reporter:
              charlie.swanson Charlie Swanson
              Participants:
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                Dates

                Created:
                Updated:
                Resolved: