Comments (2)
This is because the default Kafka configuration sets the number of replicas for the transaction topic to 3. You need to explicitly configure it to require just one replica before the broker is started.
Properties brokerConf = new Properties();
brokerConf.put("transaction.state.log.replication.factor", "1");
brokerConf.put("transaction.state.log.min.isr", "1");
brokerConf.put("transaction.state.log.num.partitions", "1");
brokerConf.put("transaction.timeout.ms", "500");
EphemeralKafkaBroker broker = EphemeralKafkaBroker.create(9092, 2100, brokerConf);
KafkaHelper helper = KafkaHelper.createFor(broker);
Properties producerProps = new Properties();
producerProps.put("transactional.id", "txid");
producerProps.put("acks", "all");
KafkaProducer<String, String> producer = helper.createStringProducer(producerProps);
// transaction code
I'll make these settings the default in the next release of the library. Until then, you'll have to write some bootstrap code like above to test transactions.
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Thank you, this solution worked and solved my problem.
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