@Override
    public boolean offer(final E e)
    {
        if (null == e)
        {
            throw new NullPointerException();
        }
        final int parallelQueuesMask = this.parallelQueuesMask;
        int start = (int) (Thread.currentThread().getId() & parallelQueuesMask);
        final MpscArrayQueue<E>[] queues = this.queues;
        if (queues[start].offer(e))
        {
            return true;
        }
        else
        {
            return slowOffer(queues, parallelQueuesMask, start + 1, e);
        }
    }
Use a set number of parallel MPSC queues to diffuse the contention on tail.
jctools-core/src/main/java/org/jctools/queues/MpscCompoundQueue.java