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  1. Core Server
  2. SERVER-48934

Investigate replica set data mismatch from Jepsen testing

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Details

    • Bug
    • Status: Closed
    • Major - P3
    • Resolution: Fixed
    • None
    • 4.4.0
    • Replication, Storage
    • None
    • Fully Compatible
    • Execution Team 2020-06-29
    • 91

    Description

      Our internal testing of MongoDB 4.4 using the Jepsen testing methodology is reporting that different members of a replica set have different data at the end of a test.

      The issue appeared to start with this drop of WiredTiger - though the failure is sporadic, so that's not a strong indicator that a bug was introduced in that set of changes.

      The Jepsen test simulates different failure modes in a distributed system - so it's possible that this failure is related to recovery, rollback to stable or replication rollback via refetch.

      We should dig into the failure, and try to find a way to isolate the root cause.

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              dianna.hohensee@mongodb.com Dianna Hohensee
              alexander.gorrod@mongodb.com Alexander Gorrod
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                Created:
                Updated:
                Resolved: