jerrypeng commented on a change in pull request #7647:
URL: https://github.com/apache/pulsar/pull/7647#discussion_r459715501



##########
File path: 
pulsar-functions/utils/src/main/java/org/apache/pulsar/functions/utils/FunctionConfigUtils.java
##########
@@ -639,6 +655,16 @@ private static void doCommonChecks(FunctionConfig 
functionConfig) {
         if ((functionConfig.getMaxMessageRetries() == null || 
functionConfig.getMaxMessageRetries() < 0) && 
!org.apache.commons.lang3.StringUtils.isEmpty(functionConfig.getDeadLetterTopic()))
 {
             throw new IllegalArgumentException("Dead Letter Topic specified, 
however max retries is set to infinity");
         }
+        if (functionConfig.getRetainKeyOrdering() != null
+                && functionConfig.getRetainKeyOrdering()

Review comment:
       Can you also check whether retain ordering is set?




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