Question

我在Apache Ignite中有一个分布式数据库，还有一个Apache Kafka流服务，该服务将数据流到Ignite群集。 Kafka拖缆的工作方式如下

创建点火节点以找到集群
在群集中将kafka streamer singleton作为服务启动
关闭点火节点

Ignite群集处于事务模式，但是我不确定这是否保证ACID或仅启用它。可以将这种Ignite流媒体服务视为ACID吗？

这是kafka彩带的代码：

public class IgniteKafkaStreamerService implements Service {

private static final long serialVersionUID = 1L;

@IgniteInstanceResource
private Ignite ignite;
private KafkaStreamer<String, JSONObject> kafkaStreamer = new KafkaStreamer<>();
private IgniteLogger logger;

public static void main(String[] args) throws InterruptedException {
    TcpDiscoverySpi spi = new TcpDiscoverySpi();

    TcpDiscoveryMulticastIpFinder ipFinder = new TcpDiscoveryMulticastIpFinder();

    // Set Multicast group.
    //ipFinder.setMulticastGroup("228.10.10.157");

    // Set initial IP addresses.
    // Note that you can optionally specify a port or a port range.
    ipFinder.setAddresses(Arrays.asList("127.0.0.1:47500..47509"));

    spi.setIpFinder(ipFinder);

    IgniteConfiguration cfg = new IgniteConfiguration();

    // Override default discovery SPI.
    cfg.setDiscoverySpi(spi);
    Ignite ignite = Ignition.getOrStart(cfg);

    // Deploy data streamer service on the server nodes.
    ClusterGroup forServers = ignite.cluster().forServers();
    IgniteKafkaStreamerService streamer = new IgniteKafkaStreamerService();
    ignite.services(forServers).deployClusterSingleton("KafkaService", streamer);
    ignite.close();
}


@Override
public void init(ServiceContext ctx) {
    logger = ignite.log();
    IgniteDataStreamer<String, JSONObject> stmr = ignite.dataStreamer("my_cache");
    stmr.allowOverwrite(true);
    stmr.autoFlushFrequency(1000);
    List<String> topics = new ArrayList<>();
    topics.add(0,"IoTData");

    kafkaStreamer.setIgnite(ignite);
    kafkaStreamer.setStreamer(stmr);
    kafkaStreamer.setThreads(4);
    kafkaStreamer.setTopic(topics);
    Properties props = new Properties();
    props.put(StreamsConfig.APPLICATION_ID_CONFIG, "NiFi-consumer");
    props.put(StreamsConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.1.242:9092");
    props.put("key.deserializer", StringDeserializer.class.getName());
    props.put("value.deserializer", StringDeserializer.class.getName());
    props.put("group.id", "hello");
    kafkaStreamer.setConsumerConfig(props);
    kafkaStreamer.setSingleTupleExtractor(msg -> {
        JSONObject jsonObj = new JSONObject(msg.value().toString());
        String key = jsonObj.getString("id") + "," + new Date(msg.timestamp());
        JSONObject value = jsonObj.accumulate("date", new Date(msg.timestamp()));

        return new AbstractMap.SimpleEntry<>(key, value);

    });
}

@Override
public void execute(ServiceContext ctx) {
    kafkaStreamer.start();
    logger.info("KafkaStreamer started.");
}

@Override
public void cancel(ServiceContext ctx) {
    kafkaStreamer.stop();
    logger.info("KafkaStreamer stopped.");
}

}

Answer 1

KafkaStreamer在后台使用IgniteDataStreamer实现。 IgniteDataStreamer本质上不是交易性的，因此没有任何交易担保。

Kafka流向Ignite的流是否以事务模式ACID运行？

1 个答案: