Github user HeartSaVioR commented on the issue:
https://github.com/apache/storm/pull/1919
What I'm referring is the blog doc:
https://www.confluent.io/blog/tutorial-getting-started-with-the-new-apache-kafka-0.9-consumer-client/
Referring to the doc, "at most once" can be achieved with below code
snippet *with no autocommit enabled*:
```
try {
while (running) {
ConsumerRecords<String, String> records = consumer.poll(1000);
try {
consumer.commitSync();
for (ConsumerRecord<String, String> record : records)
System.out.println(record.offset() + ": " + record.value());
} catch (CommitFailedException e) {
// application specific failure handling
}
}
} finally {
consumer.close();
}
```
It calls commitSync for every poll, not every emit (println in the code).
Again I'm not familiar with new Kafka API so if we think the above code
snippet has some other issues I'm completely OK to not providing strict
at-most-once.
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