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  1. Core Server
  2. SERVER-48689

MigrationDestinationManager waits for thread to join with session checked out

    • Type: Icon: Bug Bug
    • Resolution: Fixed
    • Priority: Icon: Major - P3 Major - P3
    • 4.4.1, 4.7.0
    • Affects Version/s: None
    • Component/s: Sharding
    • Labels:
    • Fully Compatible
    • ALL
    • v4.4
    • Sharding 2020-07-13, Sharding 2020-07-27
    • 33

      The MigrationDestinationManager waits for a thread to join here while holding a session checked out. This thread can do blocking work, such as checking out a different session. This can lead to a deadlock with a thread that is checking out all of the sessions for kill:

      (1) MigrationDestinationManager checks out session A.
      (2) Killing thread marks all sessions as killed.
      (3) Killing thread waits to check out session A for kill.
      (4) _thread waits to check out session B, but is blocked because session B is marked as killed.
      (5) MigrationDestinationManager waits for _thread to join.

            jack.mulrow@mongodb.com Jack Mulrow
            tess.avitabile@mongodb.com Tess Avitabile (Inactive)
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