public Map<String, Collection<ConnectorTaskId>> newlyAssignedTasks() {
            return newlyAssignedTasks;
        }
Perform a round-robin assignment of tasks to workers with existing worker load. This
assignment tries to balance the load between workers, by assigning tasks to workers that
have equal load, starting with the least loaded workers.

@param workerAssignment the current worker assignment; assigned tasks are added to this list
@param tasks the tasks to be assigned
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/IncrementalCooperativeAssignor.java