private ReplicateBlobRequest createReplicateBlobRequest() {
    return new ReplicateBlobRequest(NonBlockingRouter.correlationIdGenerator.incrementAndGet(),
        routerConfig.routerHostname, blobId, sourceDataNode.getHostname(), sourceDataNode.getPort());
  }
Create a {@link ReplicateBlobRequest} for sending to a replica.
@return The ReplicateBlobRequest.
ambry-router/src/main/java/com/github/ambry/router/ReplicateBlobOperation.java