Github user maochf commented on a diff in the pull request: https://github.com/apache/twill/pull/16#discussion_r94521832 --- 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; } - Futures.getUnchecked(executor.submit(new Runnable() { + return Futures.getUnchecked(executor.submit(new Callable<Long>() { + long nextOffset = Long.MIN_VALUE; @Override - public void run() { + public Long call() { if (stopped.get()) { - return; + return nextOffset; } - callback.onReceived(messages); + nextOffset = callback.onReceived(messages); --- End diff -- Because in line 286, the stored `nextOffset` should be returned
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