scalareactivemongoalibaba-cloud-rds

ReactiveMongo failed to connect to ReplicaSet with error `Invalid node status Primary (expected: Unknown)`

We have a MongoDB Replica set from Ali Cloud. We set up the MongoDB URL as

mongodb://username:password@dds-xxxxx-pub.mongodb.rds.aliyuncs.com:3717,dds-xxxxx-pub.mongodb.rds.aliyuncs.com:3717/admin?replicaSet=mgset-xxxxx

When the server starts, ReactiveMongo threw an error:

Invalid node status Primary for dds-2zedbafbdcdae6541787-pub.mongodb.rds.aliyuncs.com:3717 (expected: Unknown); Fallback to Unknown status

I looked through ReactiveMongo's source code but couldn't understand why it is expecting unknown status?

upSet.updateAll { n =>
          if (node.names.contains(n.name) && // the node itself
            n.status != node.status) {
            // invalidate node status on status conflict
            warn(s"Invalid node status ${node.status} for ${node.name} (expected: ${n.status}); Fallback to Unknown status")

            n._copy(status = NodeStatus.Unknown)
          } else n
        }
Solution

  • It works for us after ignoring the replicaSet option.

    http://reactivemongo.org/releases/0.1x/documentation/tutorial/alibaba-apsaradb.html

    Finally for ReactiveMongo connection, the replicaSet option can be removed from the URI, and the password placeholder must be replaced with the actual value.

    mongodb.uri = "mongodb://root:${APSARADB_PASSWORD}@dds-4e6322c0290348c49176-pub.mongodb.germany.rds.aliyuncs.com:3717/${APSARADB_DBNAME}"