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Replica Set Data Synchronization - Database Manual . . . - MongoDB If the member cannot select a sync source after two passes, it logs an error and waits 1 second before restarting the selection process The number of times a source can be changed per hour is configurable by setting the maxNumSyncSourceChangesPerHour parameter
replicaset - mongodb : could not find member to sync from . . . This is what worked for me: Execute rs syncFrom command from secondary with primary host as an argument In my case, open5gs-mongodb-0 mongodb-svc:27017 is primary and open5gs-mongodb-1 mongodb-svc:27017 is secondary So, I executed following command from the mongod shell running on secondary replica (open5gs-mongodb-1 mongodb-svc:27017):
MongoDB Replica set Scenarios and Internals – Part 1 Example showing the selection of a new sync source when the existing source is found to be invalid Here, as the logs show, during sync the node chooses a new sync source This is because it found the original sync source is not ahead, so not does not contain recent oplogs from which to sync
Replica Set Data Synchronization After Restoring a MongoDB . . . In MongoDB 4 4, one can specify the initial sync source using the initialSyncSourceReadPreference option during startup of the mongod instance The sync source must pass this conditions: This is a relaxed criteria that is used to select the sync source in case a first pass fails to select a member
Unending log messages about unable to select sync source Since the upgrade, the logs of some of our secondaries have been filled with lines like this (approximately 160MB hour): {"t":{"$date":"2025-01-21T16:21:04 550+00:00"},"s":"I", "c":"REPL", "id":3873113, "ctx":"ReplCoordExtern-22","msg":"Cannot select sync source which is not ahead of me","attr":{"syncSourceCandidate":"other-secondary-mongo
MongoDB Replica Set Sync data by Copying Data Files from . . . After all data are ready, added new node into replica set It seems the replica set starts another initial sync and copy data from Primary to the new node I got 400 GB data in primary node, so after a few hours Secondary node data size reach 600 GB and no disk space left and cause the sync fail