我在 Kubernetes(8-16 个节点,自动缩放)上运行 Kafka Connect。我总共定义了 44 个连接器,每个 Kafka 主题一个(每个主题一个分区)。这些主题由 Debezium / Postgresql 生成。有 3 个 Kafka 节点。每个连接器都将 tasks.max 设置为 4。由于 java.lang.IllegalStateException:分区 -0 没有当前分配,我的大多数连接器(但不是每个!)都有一个(总是一个)失败的任务。
这里不是 Kafka 专家,请注意;)我假设有 3 个 Kafka 节点,所以 3 个工作人员做得很好,第 4 个任务没有任何连接,所以它失败了。但是为什么有时有 4 个任务运行得很好呢?
此外,我经常遇到“由于重新平衡而导致操作冲突”的问题,这可能会持续数分钟甚至数小时。最近我删除了所有 pod 并且它们重新启动,问题消失了,但这不是长期解决方案。
tasks.max 的推荐值是多少?提前致谢!
例外:
java.lang.IllegalStateException: No current assignment for partition table-0
at org.apache.kafka.clients.consumer.internals.SubscriptionState.assignedState(SubscriptionState.java:259)
at org.apache.kafka.clients.consumer.internals.SubscriptionState.seek(SubscriptionState.java:264)
at org.apache.kafka.clients.consumer.KafkaConsumer.seek(KafkaConsumer.java:1501)
at org.apache.kafka.connect.runtime.WorkerSinkTask.rewind(WorkerSinkTask.java:601)
at org.apache.kafka.connect.runtime.WorkerSinkTask.access$1200(WorkerSinkTask.java:70)
at org.apache.kafka.connect.runtime.WorkerSinkTask$HandleRebalance.onPartitionsAssigned(WorkerSinkTask.java:675)
at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete(ConsumerCoordinator.java:291)
at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.joinGroupIfNeeded(AbstractCoordinator.java:406)
at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:340)
at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:341)
at org.apache.kafka.clients.consumer.KafkaConsumer.updateAssignmentMetadataIfNeeded(KafkaConsumer.java:1214)
at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1179)
at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1164)
at org.apache.kafka.connect.runtime.WorkerSinkTask.pollConsumer(WorkerSinkTask.java:445)
at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:318)
at org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:226)
at org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:194)
at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:175)
at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:219)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748
接收器连接器配置:
connector.class com.wepay.kafka.connect.bigquery.BigQuerySinkConnector
autoUpdateSchemas true
sanitizeTopics true
autoCreateTables true
topics <topic-name>
tasks.max 3
schemaRegistryLocation http://<ip>:8081
project <big-query-project>
maxWriteSize 10000
datasets .*=<big-query-dataset>
task.class com.wepay.kafka.connect.bigquery.BigQuerySinkTask
keyfile /credentials/<credentials-file>.json
name <connector-name>
schemaRetriever com.wepay.kafka.connect.bigquery.schemaregistry.schemaretriever.SchemaRegistrySchemaRetriever
tableWriteWait 1000
bufferSize 100000
它抛出异常java.lang.IllegalStateException: No current assignment for [...]