poorbarcode commented on code in PR #22022:
URL: https://github.com/apache/pulsar/pull/22022#discussion_r1477332270


##########
pulsar-broker/src/main/java/org/apache/pulsar/broker/service/BrokerService.java:
##########
@@ -1779,10 +1779,14 @@ private CompletableFuture<ManagedLedgerConfig> 
getManagedLedgerConfig(@Nonnull T
             }
 
             if (retentionPolicies == null) {
-                retentionPolicies = policies.map(p -> 
p.retention_policies).orElseGet(
-                        () -> new 
RetentionPolicies(serviceConfig.getDefaultRetentionTimeInMinutes(),
-                                serviceConfig.getDefaultRetentionSizeInMB())
-                );
+                if (SystemTopicNames.isSystemTopic(topicName)) {
+                    retentionPolicies = new RetentionPolicies(0, 0);

Review Comment:
   Now the priority is `topic-level policy > default {0, 0}`, should we also 
force set topic-level retention policy to `{0,0}`? Or prevent users from 
setting topic-level retention policies for a system topic?



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