xiangfu0 commented on code in PR #11040:
URL: https://github.com/apache/pinot/pull/11040#discussion_r1256556454
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pinot-plugins/pinot-stream-ingestion/pinot-kafka-2.0/src/main/java/org/apache/pinot/plugin/stream/kafka20/KafkaPartitionLevelConnectionHandler.java:
##########
@@ -61,12 +67,36 @@ public KafkaPartitionLevelConnectionHandler(String
clientId, StreamConfig stream
consumerProp.put(ConsumerConfig.ISOLATION_LEVEL_CONFIG,
_config.getKafkaIsolationLevel());
}
consumerProp.put(ConsumerConfig.CLIENT_ID_CONFIG, _clientId);
- _consumer = new KafkaConsumer<>(consumerProp);
+ _consumer = createConsumer(consumerProp);
_topicPartition = new TopicPartition(_topic, _partition);
_consumer.assign(Collections.singletonList(_topicPartition));
_kafkaMetadataExtractor =
KafkaMetadataExtractor.build(_config.isPopulateMetadata());
}
+ private Consumer<String, Bytes> createConsumer(Properties consumerProp) {
+ // Creation of the KafkaConsumer can fail for multiple reasons including
DNS issues.
+ // We arbitrarily chose 5 retries with 2 seconds sleep in between retries.
10 seconds total felt
+ // like a good balance of not waiting too long for a retry, but also not
retrying too many times.
+ int maxTries = 5;
+ int tries = 0;
+ while (true) {
+ try {
+ return new KafkaConsumer<>(consumerProp);
+ } catch (KafkaException e) {
+ tries++;
+ if (tries >= maxTries) {
+ LOGGER.error("Caught exception while creating Kafka consumer, giving
up", e);
+ throw e;
+ }
+ LOGGER.warn("Caught exception while creating Kafka consumer, retrying
{}/{}", tries, maxTries, e);
+ // We are choosing to sleepUniterruptibly here because other parts of
the Kafka consumer code do this
+ // as well. We don't want random interrupts to cause us to fail to
create the consumer and have the table
+ // stuck in ERROR state.
+ Uninterruptibles.sleepUninterruptibly(2, TimeUnit.SECONDS);
Review Comment:
Shall we do an exponential time backoff ?
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