How to avoid replication-reconfig replset issue in MongoDB?
WARNING: Avoid reconfiguring replica sets that contain members of different MongoDB versions as validation rules may differ across MongoDB versions. The rs.reconfig () shell method can trigger the current primary to step down in some situations. When the primary steps down, it forcibly closes all client connections. This is by design.
How does syncedto work in MongoDB for delayed members?
Returns the syncedTo value for each member, which shows the time when the last oplog entry was written to the secondary, as shown in the following example: A delayed member may show as 0 seconds behind the primary when the inactivity period on the primary is greater than the members [n].secondaryDelaySecs value.
What happens when the primary step down in MongoDB?
When the primary steps down, it forcibly closes all client connections. This is by design. Since it may take a period of time to elect a new primary, schedule reconfiguration changes during maintenance periods to minimize loss of write availability.
Can a client connect to MongoDB 3.6 binaries?
When bound only to the localhost, these MongoDB 3.6 binaries can only accept connections from clients (including mongosh and other members of your deployment in replica sets and sharded clusters) that are running on the same machine. Remote clients cannot connect to the binaries bound only to localhost.
How to drop a replica in MongoDB 4.2?
New in version 4.2: To immediately drop all outgoing connections from the replica set to the removed member, run the dropConnections administrative command on each remaining member on the replica set: Replace and with those of the removed member.
What does the force parameter mean in MongoDB?
The force parameter allows a reconfiguration command to be issued to a non-primary node. WARNING: Avoid reconfiguring replica sets that contain members of different MongoDB versions as validation rules may differ across MongoDB versions. The rs.reconfig () shell method can trigger the current primary to step down in some situations.
Primary step-down triggers an election to select a new primary: Starting in MongoDB 4.2, when the primary steps down, it no longer closes all client connections and writes that were in progress are killed. For details, see Behavior. In MongoDB 4.0 and earlier, when the primary steps down, it closes all client connections.