Github user HeartSaVioR commented on a diff in the pull request:

    https://github.com/apache/storm/pull/1980#discussion_r105030392
  
    --- Diff: 
external/storm-kafka-client/src/main/java/org/apache/storm/kafka/spout/KafkaSpoutConfig.java
 ---
    @@ -164,15 +164,15 @@ public Builder(Map<String, Object> kafkaProps, 
KafkaSpoutStreams kafkaSpoutStrea
             /**
              * Specifying this key deserializer overrides the property 
key.deserializer
              */
    -        public Builder<K,V> setKeyDeserializer(Deserializer<K> 
keyDeserializer) {
    +        public Builder<K,V> setKeyDeserializer(SerializableDeserializer<K> 
keyDeserializer) {
    --- End diff --
    
    I'm not 100% sure it keeps binary compatibility. `Serializable ` doesn't 
have methods so it might work, but just not sure.
    Once who makes me clear that this is also safe for binary compatibility, 
I'll give +1.


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