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tinchodias avatar tinchodias commented on September 22, 2024

Hmmm the readpreference determines which server of the replica set will receive the operation. The slaveOk=true doesn't affect if the selected server is the primary, but it is needed when the selected server is secondary (there is an error, else).

But I'm on my phone now, I will check it later to corroborate.

from voyage.

zecke avatar zecke commented on September 22, 2024

There is a race condition. While we think serverA is primary it might have recently moved to serverB. We can't win this race on the client. Only the servers can.

from voyage.

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