[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?
當我運行以下生產者代碼並且 Kafka 甚至沒有運行時,為什么我沒有收到錯誤消息?
我希望createTopics
方法拋出異常,但它不會發生。 為什么?
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返回一個CreateTopicsResult
與KafkaFutures
作為值。 由於您目前沒有阻止完成此操作的代碼(使用get
)並且沒有捕獲任何異常,因此您的代碼將正常運行,而不會收到任何代理不可用的通知。
當您的經紀人不可用時,以下代碼將拋出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 客戶端 2.5.0 對其進行了測試,這是 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.
請注意, Admin
類( AdminClient
的超類)被注釋為Evolving並且可能會在未來版本中更改。
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