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

    https://github.com/apache/twill/pull/16#discussion_r94557480
  
    --- Diff: 
twill-core/src/main/java/org/apache/twill/internal/kafka/client/SimpleKafkaConsumer.java
 ---
    @@ -273,17 +274,19 @@ private MessageCallback wrapCallback(final 
MessageCallback callback,
           final AtomicBoolean stopped = new AtomicBoolean();
           return new MessageCallback() {
             @Override
    -        public void onReceived(final Iterator<FetchedMessage> messages) {
    +        public long onReceived(final Iterator<FetchedMessage> messages) {
               if (stopped.get()) {
    -            return;
    +            return Long.MIN_VALUE;
    --- End diff --
    
    Why? The offset passed to this method is the offset being used for 
fetching, hence the creation of the iterator. The offset returned, on the other 
hand governs the offset to use for the next fetch


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