showuon commented on code in PR #13514:
URL: https://github.com/apache/kafka/pull/13514#discussion_r1176408614
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examples/src/main/java/kafka/examples/Consumer.java:
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@@ -76,12 +79,17 @@ public Consumer(String threadName,
public void run() {
// the consumer instance is NOT thread safe
try (KafkaConsumer<Integer, String> consumer = createKafkaConsumer()) {
+ // subscribes to a list of topics to get dynamically assigned
partitions
+ // this class implements the rebalance listener that we pass here
to be notified of such events
consumer.subscribe(singleton(topic), this);
Utils.printOut("Subscribed to %s", topic);
while (!closed && remainingRecords > 0) {
try {
- // next poll must be called within session.timeout.ms to
avoid rebalance
- ConsumerRecords<Integer, String> records =
consumer.poll(Duration.ofSeconds(1));
+ // if required, poll updates partition assignment and
invokes the configured rebalance listener
+ // then tries to fetch records sequentially using the last
committed offset or auto.offset.reset policy
+ // returns immediately if there are records or times out
returning an empty record set
+ // the next poll must be called within session.timeout.ms
to avoid group rebalance
+ ConsumerRecords<Integer, String> records =
consumer.poll(Duration.ofSeconds(10));
Review Comment:
Why do we poll with 10 seconds now? I think 1 sec should be long enough.
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