[英]Storm-Kafka spout not creating node in zookeeper cluster.
我使用Storm-kafka来使用Storm 0.10和Kafka 0.9.0.0。 每当我在群集上运行拓扑时,它都会从头开始读取,尽管我从属性文件中将zkRoot和使用者groupId设置为-
kafka.zkHosts=myserver.myhost.com:2181
kafka.topic=onboarding-mail-topic
kafka.zkRoot=/kafka-storm
kafka.group.id=onboarding
喷口:
BrokerHosts zkHosts = new ZkHosts(prop.getProperty("kafka.zkHosts"));
String topicName = prop.getProperty("kafka.topic");
String zkRoot = prop.getProperty("kafka.zkRoot");
String groupId = prop.getProperty("kafka.group.id");
//kafka spout conf
SpoutConfig kafkaConfig = new SpoutConfig(zkHosts, topicName, zkRoot, groupId);
kafkaConfig.scheme = new SchemeAsMultiScheme(new StringScheme());
KafkaSpout kafkaSpout = new KafkaSpout(kafkaConfig);
当我检查Zookeeper ls /
它不告诉我kafka-storm
[controller_epoch, controller, brokers, storm, zookeeper, kafka-manager, admin, isr_change_notification, consumers, config]
终于,我明白了。 由于从卡夫卡读取和向卡夫卡写入偏移量的控制方式不同。
如果要在风暴群集上运行拓扑,而不考虑单节点或多节点,请确保在storm.yaml文件中设置了以下内容
storm.zookeeper.servers
和
storm.zookeeper.port
除zkHosts和zkRoot以及消费者组ID之外的其他属性。
或最佳做法是在创建KafkaSpout时通过设置正确的值来覆盖拓扑中的这些属性,例如-
BrokerHosts zkHosts = new ZkHosts(prop.getProperty("kafka.zkHosts"));
String topicName = prop.getProperty("kafka.topic");
String zkRoot = prop.getProperty("kafka.zkRoot");
String groupId = prop.getProperty("kafka.group.id");
String kafkaServers = prop.getProperty("kafka.zkServers");
String zkPort = prop.getProperty("kafka.zkPort");
//kafka spout conf
SpoutConfig kafkaConfig = new SpoutConfig(zkHosts, topicName, zkRoot, groupId);
kafkaConfig.scheme = new SchemeAsMultiScheme(new StringScheme());
kafkaConfig.zkServers = Arrays.asList(kafkaServers);
kafkaConfig.zkPort = Integer.valueOf(zkPort);
KafkaSpout kafkaSpout = new KafkaSpout(kafkaConfig);
甚至可以将这些值放在Config对象中。 这样做会更好,因为您可能希望将偏移量信息存储到其他一些Zookeeper集群,而您的拓扑将从完全不同的代理读取消息
KafkaSpout程式码片段,供您理解-
@Override
public void open(Map conf, final TopologyContext context, final SpoutOutputCollector collector) {
_collector = collector;
Map stateConf = new HashMap(conf);
List<String> zkServers = _spoutConfig.zkServers;
if (zkServers == null) {
zkServers = (List<String>) conf.get(Config.STORM_ZOOKEEPER_SERVERS);
}
Integer zkPort = _spoutConfig.zkPort;
if (zkPort == null) {
zkPort = ((Number) conf.get(Config.STORM_ZOOKEEPER_PORT)).intValue();
}
stateConf.put(Config.TRANSACTIONAL_ZOOKEEPER_SERVERS, zkServers);
stateConf.put(Config.TRANSACTIONAL_ZOOKEEPER_PORT, zkPort);
stateConf.put(Config.TRANSACTIONAL_ZOOKEEPER_ROOT, _spoutConfig.zkRoot);
_state = new ZkState(stateConf);
_connections = new DynamicPartitionConnections(_spoutConfig, KafkaUtils.makeBrokerReader(conf, _spoutConfig));
// using TransactionalState like this is a hack
int totalTasks = context.getComponentTasks(context.getThisComponentId()).size();
if (_spoutConfig.hosts instanceof StaticHosts) {
_coordinator = new StaticCoordinator(_connections, conf, _spoutConfig, _state, context.getThisTaskIndex(), totalTasks, _uuid);
} else {
_coordinator = new ZkCoordinator(_connections, conf, _spoutConfig, _state, context.getThisTaskIndex(), totalTasks, _uuid);
}
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