[KAFKA-5880] Transactional producer and read committed consumer causes consumer to stuck

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: clients
• Assignee: Unassigned
• Reporter: Lae
• Created: 13/Sep/17 04:34
• Updated: 19/Jul/18 20:17

Description

We use transactional producers, and have configured isolation level on the consumer to only read committed data. The consumer has somehow got into a stuck state where it can no longer move forward because the Kafka server always return empty list of records despite there are thousands more successful transactions after the offset.

This is an example producer code:

Properties config = new Properties();
config.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
config.put(ProducerConfig.TRANSACTIONAL_ID_CONFIG, UUID.randomUUID().toString());
config.put(ProducerConfig.COMPRESSION_TYPE_CONFIG, "lz4");
config.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
config.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
try (Producer<String, String> producer = new KafkaProducer<>(config)) {
    producer.initTransactions();
    try {
        producer.beginTransaction();
        // Multiple producer.send(...) here
        producer.commitTransaction();
    } catch (Throwable e) {
        producer.abortTransaction();
    }
}

This is the test consumer code:

Properties config = new Properties();
config.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
config.put(ConsumerConfig.GROUP_ID_CONFIG, "my-group");
config.put(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG, "earliest");
config.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, "false");
config.put(ConsumerConfig.ISOLATION_LEVEL_CONFIG, IsolationLevel.READ_COMMITTED.toString().toLowerCase(ENGLISH));
config.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());
config.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class.getName());

try (KafkaConsumer<String, String> consumer = new KafkaConsumer<>(config)) {
    consumer.subscribe(Collections.singleton("index-updates"));
    while (true) {
        ConsumerRecords<String, String> records = consumer.poll(5000);
        for (ConsumerRecord<String, String> record : records) {
            System.err.println(record.value());
        }
        consumer.commitSync();
    }
}

I have also attached the problematic partition data index-updates-3.zip, to reproduce the issue using the data, you can run a local Kafka instance, then create a topic called "index-updates" with 10 partitions, and replace the content of the index-updates-3 log directory with the attached content, then running the above consumer code.

Then the consumer will be stuck at some point (not always at the same offset) not making anymore progress even if you send new data into the partition (other partitions seem fine). The following example is when the consumer was stuck at offset 46644, and the Kafka server always return empty list of records when the consumer fetches from 46644:

root@0b1e67f0c34b:/# /opt/kafka/bin/kafka-consumer-groups.sh --describe --group my-group --bootstrap-server localhost:9092
Note: This will only show information about consumers that use the Java consumer API (non-ZooKeeper-based consumers).


TOPIC                          PARTITION  CURRENT-OFFSET  LOG-END-OFFSET  LAG        CONSUMER-ID                                       HOST                           CLIENT-ID
index-updates                  0          15281           15281           0          consumer-1-c8f3fede-ef6f-4d12-a426-44aa9c47e71f   /10.100.1.97                   consumer-1
index-updates                  1          0               0               0          consumer-1-c8f3fede-ef6f-4d12-a426-44aa9c47e71f   /10.100.1.97                   consumer-1
index-updates                  2          0               0               0          consumer-1-c8f3fede-ef6f-4d12-a426-44aa9c47e71f   /10.100.1.97                   consumer-1
index-updates                  3          46644           65735           19091      consumer-1-c8f3fede-ef6f-4d12-a426-44aa9c47e71f   /10.100.1.97                   consumer-1
index-updates                  4          0               0               0          consumer-1-c8f3fede-ef6f-4d12-a426-44aa9c47e71f   /10.100.1.97                   consumer-1
index-updates                  5          0               0               0          consumer-1-c8f3fede-ef6f-4d12-a426-44aa9c47e71f   /10.100.1.97                   consumer-1
index-updates                  6          0               0               0          consumer-1-c8f3fede-ef6f-4d12-a426-44aa9c47e71f   /10.100.1.97                   consumer-1
index-updates                  7          0               0               0          consumer-1-c8f3fede-ef6f-4d12-a426-44aa9c47e71f   /10.100.1.97                   consumer-1
index-updates                  8          0               0               0          consumer-1-c8f3fede-ef6f-4d12-a426-44aa9c47e71f   /10.100.1.97                   consumer-1
index-updates                  9          0               0               0          consumer-1-c8f3fede-ef6f-4d12-a426-44aa9c47e71f   /10.100.1.97                   consumer-1
root@0b1e67f0c34b:/#