tmzk1005 commented on code in PR #4234:
URL: https://github.com/apache/bookkeeper/pull/4234#discussion_r1532238863


##########
bookkeeper-server/src/test/java/org/apache/bookkeeper/client/MockBookKeeperTestCase.java:
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@@ -303,8 +303,12 @@ protected void suspendBookieForceLedgerAcks(BookieId 
address) {
     }
 
     protected void resumeBookieWriteAcks(BookieId address) {
-        suspendedBookiesForForceLedgerAcks.remove(address);
-        List<Runnable> pendingResponses = 
deferredBookieForceLedgerResponses.remove(address);
+        List<Runnable> pendingResponses;
+        synchronized (address) {

Review Comment:
   Use field `suspendedBookiesForForceLedgerAcks` or just `this` as the object 
monitor would be ok too, but data race happens on the same `BookieId` instance 
causes the problem, so I used it as the object monitor. 
   
   I will add a comment. 
   Thanks~



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