I can create a "standalone, normal" (ie not using Hazelcast; not distributed) executor service using a priority blocking queue by following the simple example from https://jvmaware.com/priority-queue-and-threadpool/
However, I tried to adapt the same strategy to support PRIORITIZATION of submitted tasks for Hazelcast, but couldn't get it to work. Is there a way I can pass a Hazelcast distributed priority queue to the Hazelcast executor service to use? (I tried to do ConcurrencyUtil.setDefaultAsyncExecutor(tpe); where tpe is the custom thread pool executor as described in the first link, but this did not work.
I don't think you can change the underlying queue implementation for IExecutorService from configuration.
If you look at the source code that creates ExecutorService implementation
You can see that NamedThreadPoolExecutor is created with a hard coded LinkedBlockingQueue
And the CachedExecutorServiceDelegate also has hard coded LinkedBlockingQueue https://github.com/hazelcast/hazelcast/blob/master/hazelcast/src/main/java/com/hazelcast/internal/util/executor/CachedExecutorServiceDelegate.java#L68