@Override
        public String toString() {
            return "FailoverTask{" +
                "request=" + request +
                '}';
        }
To perform a Delta WAL failover, follow these steps:
1. Ensure the old node stops writing to the delta WAL.
2. Instruct the controller to reject all requests sent by the old node.
3. Upload the delta WAL to S3.
4. Lastly, close any streams that were opened by the old node and are currently active.
s3stream/src/main/java/com/automq/stream/s3/failover/Failover.java