leizhiyuan opened a new issue, #3286:
URL: https://github.com/apache/bookkeeper/issues/3286

   **FEATURE REQUEST**
   
   1. Please describe the feature you are requesting.
   
   when we use OrderedExecutor, sometimes the task is slow, especially when we 
put the same  ledgerId  to one thread 
   
   now the timerRunnable will print 
   
   ```
   09:24:36.062 [bookkeeper-ml-scheduler-OrderedScheduler-6-0] WARN  
org.apache.bookkeeper.common.util.OrderedExecutor - Runnable 
java.util.concurrent.CompletableFuture$UniAccept@1cb81e6c:class 
java.util.concurrent.CompletableFuture$UniAccept took too long 2056092 micros 
to execute.
   ```
   it is not helpful for solving some problem
   
   
   maybe we can start a monitor thread, when the time  of one task  exceeds 
threshold in the thread pool. we  also printStackTrace , it will be very 
powerful 
    
   3. Indicate the importance of this issue to you (blocker, must-have, 
should-have, nice-to-have).
      Are you currently using any workarounds to address this issue?
   
   4. Provide any additional detail on your proposed use case for this feature.
   
   


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