3pacccccc commented on code in PR #25104:
URL: https://github.com/apache/pulsar/pull/25104#discussion_r2643029960


##########
managed-ledger/src/test/java/org/apache/bookkeeper/mledger/impl/ManagedCursorTest.java:
##########
@@ -251,17 +252,36 @@ public void 
testConcurrentPropertyOperationsThreadSafety() throws Exception {
                             }
                             break;
                     }
+                    completedOperations.incrementAndGet();
+
                 } catch (ConcurrentModificationException cme) {
+                    // Record ConcurrentModificationException but don't fail 
immediately

Review Comment:
   > HashMap will throw ConcurrentModificationException only in specific 
methods such as `forEach`, `compute`, and a few others.
   > 
   > I didn't run the tests without the fix to validate whether 
ConcurrentModificationException would be thrown. Have you seen it if you revert 
the fix and run the test?
   > 
   > I think that this catch block can be removed and just fail immediately 
like it's done for other Exceptions.
   
   Yes, exactly. This `ConcurrentModificationException` does occur in the 
original (unfixed) version. I added the explicit catch in the test to verify 
that the fix resolves the issue.



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