public void produce(SimplifiedLog message, String topicName) {
if (producer == null)
producer =
KafkaUtils.createProducer(
KafkaUtils.createZkClient(zkServer.getConnectString()), ASYNC, false);
producer.send(new KeyedMessage<>(topicName, message.getHostName(), message));
LOGGER.debug("Sent message: {}", message);
}
public void start() throws Exception {
zkServer = new TestingServer(zkPort, true);
zkClient = KafkaUtils.createZkClient(zkServer.getConnectString());
kafkaServer = new KafkaServerStartable(new KafkaConfig(getServerProperties()));
kafkaServer.startup();
LOGGER.debug("Started Kafka server at port {}", kafkaPort);
}
public List<SimplifiedLog> consume(String topicName, int topicPartitions, int expectedMsg)
throws InterruptedException {
ConsumerConnector consumer =
KafkaUtils.createConsumer(zkServer.getConnectString(), "test_group", "1");
List<KafkaStream<String, SimplifiedLog>> streams =
KafkaUtils.getConsumerStreams(consumer, topicName, topicPartitions);
List<Callable<List<SimplifiedLog>>> tasks = new ArrayList<>();
streams.forEach(stream -> tasks.add(createConsumerThread(stream.iterator(), expectedMsg)));
ExecutorService executor = Executors.newFixedThreadPool(streams.size());
List<Future<List<SimplifiedLog>>> futures =
executor.invokeAll(tasks, 5 * expectedMsg, TimeUnit.SECONDS);
List<SimplifiedLog> received = getResultsFromFutures(futures);
consumer.shutdown();
return received;
}
public void start() {
List<String> zkServers = _consumerConfig.zkServers;
String servers = Joiner.on(",").join(zkServers);
_state = new ZkState(servers, _consumerConfig.zkRoot);
_connections =
new DynamicPartitionConnections(
_consumerConfig, KafkaUtils.makeBrokerReader(_consumerConfig));
// using TransactionalState like this is a hack
_coordinator =
new ZkCoordinator(
_connections, _consumerConfig, _state, _taskIndex, _totalTasks, _uuid, _site);
Thread t = new Thread(new Worker());
t.start();
}
@Test
public void testKafkaStream() throws InterruptedException {
final String topic1 = "topic1";
final String topic2 = "topic2";
// hold a reference to the current offset ranges, so it can be used downstream
final AtomicReference<OffsetRange[]> offsetRanges = new AtomicReference<>();
String[] topic1data = createTopicAndSendData(topic1);
String[] topic2data = createTopicAndSendData(topic2);
Set<String> sent = new HashSet<>();
sent.addAll(Arrays.asList(topic1data));
sent.addAll(Arrays.asList(topic2data));
Map<String, String> kafkaParams = new HashMap<>();
kafkaParams.put("metadata.broker.list", kafkaTestUtils.brokerAddress());
kafkaParams.put("auto.offset.reset", "smallest");
JavaDStream<String> stream1 =
KafkaUtils.createDirectStream(
ssc,
String.class,
String.class,
StringDecoder.class,
StringDecoder.class,
kafkaParams,
topicToSet(topic1))
.transformToPair(
// Make sure you can get offset ranges from the rdd
new Function<JavaPairRDD<String, String>, JavaPairRDD<String, String>>() {
@Override
public JavaPairRDD<String, String> call(JavaPairRDD<String, String> rdd) {
OffsetRange[] offsets = ((HasOffsetRanges) rdd.rdd()).offsetRanges();
offsetRanges.set(offsets);
Assert.assertEquals(topic1, offsets[0].topic());
return rdd;
}
})
.map(
new Function<Tuple2<String, String>, String>() {
@Override
public String call(Tuple2<String, String> kv) {
return kv._2();
}
});
JavaDStream<String> stream2 =
KafkaUtils.createDirectStream(
ssc,
String.class,
String.class,
StringDecoder.class,
StringDecoder.class,
String.class,
kafkaParams,
topicOffsetToMap(topic2, 0L),
new Function<MessageAndMetadata<String, String>, String>() {
@Override
public String call(MessageAndMetadata<String, String> msgAndMd) {
return msgAndMd.message();
}
});
JavaDStream<String> unifiedStream = stream1.union(stream2);
final Set<String> result = Collections.synchronizedSet(new HashSet<String>());
unifiedStream.foreachRDD(
new VoidFunction<JavaRDD<String>>() {
@Override
public void call(JavaRDD<String> rdd) {
result.addAll(rdd.collect());
for (OffsetRange o : offsetRanges.get()) {
System.out.println(
o.topic() + " " + o.partition() + " " + o.fromOffset() + " " + o.untilOffset());
}
}
});
ssc.start();
long startTime = System.currentTimeMillis();
boolean matches = false;
while (!matches && System.currentTimeMillis() - startTime < 20000) {
matches = sent.size() == result.size();
Thread.sleep(50);
}
Assert.assertEquals(sent, result);
ssc.stop();
}
