@Override
    public boolean assign(final Map<ProcessId, ClientState> clients,
                          final Set<TaskId> allTaskIds,
                          final Set<TaskId> statefulTaskIds,
                          final RackAwareTaskAssignor rackAwareTaskAssignor,
                          final AssignmentConfigs configs) {
        // Pass null for RackAwareTaskAssignor to disable it if we fallback
        delegate.assign(clients, allTaskIds, statefulTaskIds, null, configs);
        return true;
    }
A special task assignor implementation to be used as a fallback in case the
configured assignor couldn't be invoked.

Specifically, this assignor must:
1. ignore the task lags in the ClientState map
2. always return true, indicating that a follow-up rebalance is needed
streams/src/main/java/org/apache/kafka/streams/processor/internals/assignment/FallbackPriorTaskAssignor.java