Github user shoukunhuai commented on a diff in the pull request:

    https://github.com/apache/activemq-artemis/pull/1894#discussion_r170405300
  
    --- Diff: 
artemis-server/src/main/java/org/apache/activemq/artemis/core/persistence/impl/journal/AbstractJournalStorageManager.java
 ---
    @@ -1488,7 +1494,13 @@ public synchronized void start() throws Exception {
     
           beforeStart();
     
    -      singleThreadExecutor = executorFactory.getExecutor();
    +      ThreadFactory tFactory = AccessController.doPrivileged(new 
PrivilegedAction<ThreadFactory>() {
    +         @Override
    +         public ThreadFactory run() {
    +            return new ActiveMQThreadFactory("ActiveMQ-journal-server-" + 
this.toString(), true, ClientSessionFactoryImpl.class.getClassLoader());
    +         }
    +      });
    +      singleThreadExecutor = Executors.newSingleThreadExecutor(tFactory);
    --- End diff --
    
    We believe this happens when
    - using fixed thread pool which is the default, and
    - an address has many producers, more then thread pool's size, and
    - the address is about to exit paging state


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