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@FGasper FGasper commented Nov 12, 2025

This makes Migration Verifier prefer tailing the oplog rather than reading a change stream when all of the following are true:

  • the cluster is a replset
  • the cluster is >= 4.4
  • no namespace filtering is used

Oplog tailing is significantly easier on the server than a change stream, which yields better performance and allows verification of more migrations.

@FGasper FGasper changed the title REP-6804 Read the oplog directly when possible REP-6804 Add option to read oplog directly Nov 13, 2025
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