[英]Kafka producer throws “Received unknown topic or partition error” when sending to topic created via AdminClient createTopics method
[英]Why is AdminClient not failing when creating a topic with Kafka cluster not running?
当我运行以下生产者代码并且 Kafka 甚至没有运行时,为什么我没有收到错误消息?
我希望createTopics
方法抛出异常,但它不会发生。 为什么?
final Properties properties = new Properties();
properties.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
properties.put(AdminClientConfig.REQUEST_TIMEOUT_MS_CONFIG, "1000");
AdminClient adminClient = AdminClient.create(properties);
NewTopic newTopic = new NewTopic("events", 1, (short) 1);
adminClient.createTopics(Arrays.asList(newTopic));
adminClient.close();
方法createTopics返回一个CreateTopicsResult
与KafkaFutures
作为值。 由于您目前没有阻止完成此操作的代码(使用get
)并且没有捕获任何异常,因此您的代码将正常运行,而不会收到任何代理不可用的通知。
当您的经纪人不可用时,以下代码将抛出ExecutionException
:
final Properties properties = new Properties();
properties.put(AdminClientConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
properties.put(AdminClientConfig.REQUEST_TIMEOUT_MS_CONFIG, "1000");
properties.put(AdminClientConfig.DEFAULT_API_TIMEOUT_MS_CONFIG, "5000");
AdminClient adminClient = AdminClient.create(properties);
NewTopic newTopic = new NewTopic("events-test", 1, (short) 1);
CreateTopicsResult topicResult = adminClient.createTopics(Arrays.asList(newTopic));
KafkaFuture<Void> resultFuture = topicResult.all();
try {
resultFuture.get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
adminClient.close();
我使用 Kafka 客户端 2.5.0 对其进行了测试,这是 Excpetion:
java.util.concurrent.ExecutionException: org.apache.kafka.common.errors.TimeoutException: Call(callName=createTopics, deadlineMs=1601136227182) timed out at 1601136227183 after 1 attempt(s)
at org.apache.kafka.common.internals.KafkaFutureImpl.wrapAndThrow(KafkaFutureImpl.java:45)
at org.apache.kafka.common.internals.KafkaFutureImpl.access$000(KafkaFutureImpl.java:32)
at org.apache.kafka.common.internals.KafkaFutureImpl$SingleWaiter.await(KafkaFutureImpl.java:89)
at org.apache.kafka.common.internals.KafkaFutureImpl.get(KafkaFutureImpl.java:260)
at org.michael.big.data.kafka.java.BasicAdminClient.main(BasicAdminClient.java:27)
Caused by: org.apache.kafka.common.errors.TimeoutException: Call(callName=createTopics, deadlineMs=1601136227182) timed out at 1601136227183 after 1 attempt(s)
Caused by: org.apache.kafka.common.errors.TimeoutException: Timed out waiting for a node assignment.
请注意, Admin
类( AdminClient
的超类)被注释为Evolving并且可能会在未来版本中更改。
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