Github user maochf commented on a diff in the pull request:
https://github.com/apache/twill/pull/16#discussion_r94874821
--- Diff:
twill-core/src/main/java/org/apache/twill/kafka/client/KafkaConsumer.java ---
@@ -33,14 +33,16 @@
/**
* Invoked when new messages is available.
+ * @param startOffset Offset of the first {@link FetchedMessage} in
the iterator of new messages.
--- End diff --
If one specified `-1L` or `-2L`, but no message is consumed in the method,
then `-1L` or `-2L` still has to be returned
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