lhotari commented on code in PR #22479:
URL: https://github.com/apache/pulsar/pull/22479#discussion_r1560453839


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/BrokerService.java:
##########
@@ -631,15 +631,20 @@ protected void startStatsUpdater(int 
statsUpdateInitialDelayInSecs, int statsUpd
     }
 
     protected void startDeduplicationSnapshotMonitor() {
+        // We do not know whether users will enable deduplication on namespace 
level/topic level or not, so keep this
+        // scheduled task runs.
         int interval = 
pulsar().getConfiguration().getBrokerDeduplicationSnapshotFrequencyInSeconds();
-        if (interval > 0 && 
pulsar().getConfiguration().isBrokerDeduplicationEnabled()) {
+        if (interval > 0) {
             this.deduplicationSnapshotMonitor = 
OrderedScheduler.newSchedulerBuilder()
                     .name("deduplication-snapshot-monitor")
                     .numThreads(1)
                     .build();
             deduplicationSnapshotMonitor.scheduleAtFixedRate(() -> 
forEachTopic(
                     Topic::checkDeduplicationSnapshot)
                     , interval, interval, TimeUnit.SECONDS);
+        } else {
+            throw new IllegalArgumentException("The config 
brokerDeduplicationSnapshotFrequencyInSeconds should be"

Review Comment:
   Wouldn't this prevent the broker from starting? I guess that is fine, but it 
would be great to have a way to document this in release notes as an 
intentional breaking change.



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