kw2542 commented on a change in pull request #1251: SAMZA-2431: Fix the 
checkpoint and changelog topic auto-creation.
URL: https://github.com/apache/samza/pull/1251#discussion_r366639912
 
 

 ##########
 File path: 
samza-kafka/src/main/java/org/apache/samza/system/kafka/KafkaSystemAdmin.java
 ##########
 @@ -541,8 +541,11 @@ public KafkaStreamSpec toKafkaSpec(StreamSpec spec) {
           new KafkaStreamSpec(spec.getId(), spec.getPhysicalName(), 
systemName, 1, coordinatorStreamReplicationFactor,
               coordinatorStreamProperties);
     } else if (spec.isCheckpointStream()) {
-      kafkaSpec = 
KafkaStreamSpec.fromSpec(StreamSpec.createCheckpointStreamSpec(spec.getPhysicalName(),
 systemName))
-              .copyWithReplicationFactor(Integer.parseInt(new 
KafkaConfig(config).getCheckpointReplicationFactor().get()));
+      Properties checkpointTopicProperties = new Properties();
+      checkpointTopicProperties.putAll(spec.getConfig());
+      kafkaSpec = 
KafkaStreamSpec.fromSpec(StreamSpec.createCheckpointStreamSpec(spec.getPhysicalName(),
 spec.getSystemName()))
+              .copyWithReplicationFactor(Integer.parseInt(new 
KafkaConfig(config).getCheckpointReplicationFactor().get()))
+              .copyWithProperties(checkpointTopicProperties);
 
 Review comment:
   We can do it separately, can we add .copyWithConfig or .copyWithMap which 
takes Config or Map<String, String> ?
   
   copyWithProperties is not user friendly, as we are converting a Map/Config 
to a properties, and this method basically convert it back. 

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