[AMQ 7.4, thread dumps in broker logs] seeing excessive amount of AMQ222109 warnings and AMQ222199 thread dumps

Issue

• the broker is continuously logging the following output

2019-08-22 07:45:45,477 WARN  [org.apache.activemq.artemis.core.server] AMQ222109: Timed out waiting for write lock on consumer. Check the Thread dump
2019-08-22 07:45:46,094 WARN  [org.apache.activemq.artemis.core.server] AMQ222199: Thread dump: *******************************************************************************
Complete Thread dump 
"Thread-31274 (ActiveMQ-IO-server-org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl$6@532e27ab)" Id=49298 TIMED_WAITING on java.util.concurrent.SynchronousQueue$TransferStack@4450731f
    at sun.misc.Unsafe.park(Native Method)
    -  waiting on java.util.concurrent.SynchronousQueue$TransferStack@4450731f
    at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:215)
    at java.util.concurrent.SynchronousQueue$TransferStack.awaitFulfill(SynchronousQueue.java:460)
    at java.util.concurrent.SynchronousQueue$TransferStack.transfer(SynchronousQueue.java:362)
    at java.util.concurrent.SynchronousQueue.poll(SynchronousQueue.java:941)
    at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1073)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1134)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:118)

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