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https://issues.apache.org/jira/browse/KAFKA-7878?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
John Hawkins updated KAFKA-7878:
--------------------------------
Affects Version/s: 3.7.0
> Connect Task already exists in this worker when failed to create consumer
> -------------------------------------------------------------------------
>
> Key: KAFKA-7878
> URL: https://issues.apache.org/jira/browse/KAFKA-7878
> Project: Kafka
> Issue Type: Bug
> Components: connect
> Affects Versions: 1.0.1, 2.0.1, 3.7.0
> Reporter: Loïc Monney
> Priority: Major
>
> *Assumption*
> 1. DNS is not available during a few minutes
> 2. Consumer group rebalances
> 3. Client is not able to resolve DNS entries anymore and fails
> 4. Task seems already registered, so at next rebalance the task will fail due
> to *Task already exists in this worker* and the only way to recover is to
> restart the connect process
> *Real log entries*
> * Distributed cluster running one connector on top of Kubernetes
> * Connect 2.0.1
> * kafka-connect-hdfs 5.0.1
> {noformat}
> [2019-01-28 13:31:25,914] WARN Removing server kafka.xxx.net:9093 from
> bootstrap.servers as DNS resolution failed for kafka.xxx.net
> (org.apache.kafka.clients.ClientUtils:56)
> [2019-01-28 13:31:25,915] ERROR WorkerSinkTask\{id=xxx-22} Task failed
> initialization and will not be started.
> (org.apache.kafka.connect.runtime.WorkerSinkTask:142)
> org.apache.kafka.connect.errors.ConnectException: Failed to create consumer
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.createConsumer(WorkerSinkTask.java:476)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.initialize(WorkerSinkTask.java:139)
> at org.apache.kafka.connect.runtime.Worker.startTask(Worker.java:452)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.startTask(DistributedHerder.java:873)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.access$1600(DistributedHerder.java:111)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder$13.call(DistributedHerder.java:888)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder$13.call(DistributedHerder.java:884)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: org.apache.kafka.common.KafkaException: Failed to construct kafka
> consumer
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:799)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:615)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:596)
> at
> org.apache.kafka.connect.runtime.WorkerSinkTask.createConsumer(WorkerSinkTask.java:474)
> ... 10 more
> Caused by: org.apache.kafka.common.config.ConfigException: No resolvable
> bootstrap urls given in bootstrap.servers
> at
> org.apache.kafka.clients.ClientUtils.parseAndValidateAddresses(ClientUtils.java:66)
> at
> org.apache.kafka.clients.consumer.KafkaConsumer.<init>(KafkaConsumer.java:709)
> ... 13 more
> [2019-01-28 13:31:25,925] INFO Finished starting connectors and tasks
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder:868)
> [2019-01-28 13:31:25,926] INFO Rebalance started
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder:1239)
> [2019-01-28 13:31:25,927] INFO Stopping task xxx-22
> (org.apache.kafka.connect.runtime.Worker:555)
> [2019-01-28 13:31:26,021] INFO Finished stopping tasks in preparation for
> rebalance
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder:1269)
> [2019-01-28 13:31:26,021] INFO [Worker clientId=connect-1,
> groupId=xxx-cluster] (Re-)joining group
> (org.apache.kafka.clients.consumer.internals.AbstractCoordinator:509)
> [2019-01-28 13:31:30,746] INFO [Worker clientId=connect-1,
> groupId=xxx-cluster] Successfully joined group with generation 29
> (org.apache.kafka.clients.consumer.internals.AbstractCoordinator:473)
> [2019-01-28 13:31:30,746] INFO Joined group and got assignment:
> Assignment\{error=0, leader='connect-1-05961f03-52a7-4c02-acc2-0f1fb021692e',
> leaderUrl='http://192.168.46.59:8083/', offset=32, connectorIds=[],
> taskIds=[xxx-22]}
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder:1217)
> [2019-01-28 13:31:30,747] INFO Starting connectors and tasks using config
> offset 32 (org.apache.kafka.connect.runtime.distributed.DistributedHerder:858)
> [2019-01-28 13:31:30,747] INFO Starting task xxx-22
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder:872)
> [2019-01-28 13:31:30,747] INFO Creating task xxx-22
> (org.apache.kafka.connect.runtime.Worker:396)
> [2019-01-28 13:31:30,748] ERROR Couldn't instantiate task xxx-22 because it
> has an invalid task configuration. This task will not execute until
> reconfigured.
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder:890)
> org.apache.kafka.connect.errors.ConnectException: Task already exists in this
> worker: xxx-22
> at org.apache.kafka.connect.runtime.Worker.startTask(Worker.java:399)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.startTask(DistributedHerder.java:873)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder.access$1600(DistributedHerder.java:111)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder$13.call(DistributedHerder.java:888)
> at
> org.apache.kafka.connect.runtime.distributed.DistributedHerder$13.call(DistributedHerder.java:884)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> [2019-01-28 13:31:30,749] INFO Finished starting connectors and tasks
> (org.apache.kafka.connect.runtime.distributed.DistributedHerder:868)
> {noformat}
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