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  1. Core Server
  2. SERVER-40326

Don't access the filesystem under std::mutex in the chunk cloner's nextModsBatch

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: Major - P3
    • Resolution: Duplicate
    • Affects Version/s: 3.4.20, 3.6.11, 4.0.7, 4.1.9
    • Fix Version/s: None
    • Component/s: Sharding
    • Operating System:
      ALL
    • Sprint:
      Sharding 2019-04-08

      Description

      Accessing the filesystem under a std::mutex can cause deadlocks. When retrieving the next modifications batch in the migration cloner source, we check if each document still exists in the storage subsystem. This is done under the cloner's internal mutex. We should rework the function so to not access the storage subsystem while holding the mutex.

      Note: caused a BF in a patch build.

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                  Updated:
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