[jira] [Created] (KAFKA-13486) Kafka Connect: Failed to start task due to NPE

["Geliba Uilte (Jira)" <ji...@apache.org>]

Geliba Uilte created KAFKA-13486:
------------------------------------

             Summary: Kafka Connect: Failed to start task due to NPE
                 Key: KAFKA-13486
                 URL: https://issues.apache.org/jira/browse/KAFKA-13486
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
    Affects Versions: 2.7.1
         Environment: Kubernetes, custom docker image
            Reporter: Geliba Uilte


I have a Kafka Connect cluster with three workers running on Kubernetes. The workers communicate with each other using pod's IP (internal IP 192.X.X.X). Sometimes, pods are redistributed to different node. I am not sure if it has anything to do with the issue, but I think it makes pod's IP to be changed and Kafka Connect needs to rebalance.

Occasionally, tasks fail due to NPE.

From the connectors/:connector/status REST API, I can see this trace:

 
{code:java}
at org.apache.kafka.connect.runtime.Worker.startTask(Worker.java:517)
at org.apache.kafka.connect.runtime.distributed.DistributedHerder.startTask(DistributedHerder.java:1258)
at org.apache.kafka.connect.runtime.distributed.DistributedHerder.access$1700(DistributedHerder.java:127)
at org.apache.kafka.connect.runtime.distributed.DistributedHerder$10.call(DistributedHerder.java:1273)
at org.apache.kafka.connect.runtime.distributed.DistributedHerder$10.call(DistributedHerder.java:1269)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834){code}
 

It looks like the issue is similar to KAFKA-10323 and

It seems NPE is thrown from [here|https://github.com/apache/kafka/blob/2.7.1/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Worker.java#L517].

 

 



--
This message was sent by Atlassian Jira
(v8.20.1#820001)