Gwen Shapira created KAFKA-7121:
-----------------------------------
Summary: Intermittently, Connectors fail to assign tasks and keep
retrying every second forever.
Key: KAFKA-7121
URL: https://issues.apache.org/jira/browse/KAFKA-7121
Project: Kafka
Issue Type: Bug
Components: KafkaConnect
Reporter: Gwen Shapira
We started a connector, and even though it is in RUNNING status, tasks are not
getting assigned:
{"name":"prod-xxx-v2","connector":{"state":"RUNNING","worker_id":"[0.0.0.0:8083|http://0.0.0.0:8083/]"},"tasks":[],"type":"sink"}
Other connectors are running without issues.
Attempt to restart the connector returned 409 status.
Logs show the following messages, keep repeating for hours:
```
[2018-06-29 20:23:19,288] ERROR Task reconfiguration for prod-xxx-v2 failed
unexpectedly, this connector will not be properly reconfigured unless manually
triggered. (org.apache.kafka.connect.runtime.distributed.DistributedHerder:956)
[2018-06-29 20:23:19,289] INFO 10.200.149.201 - - [29/Jun/2018:20:23:19 +0000]
"POST /connectors/prod-xxx-v2/tasks?forward=false HTTP/1.1" 409 113 0
(org.apache.kafka.connect.runtime.rest.RestServer:60)
[2018-06-29 20:23:19,289] INFO 10.200.149.201 - - [29/Jun/2018:20:23:19 +0000]
"POST /connectors/prod-xxx-v2/tasks?forward=true HTTP/1.1" 409 113 1
(org.apache.kafka.connect.runtime.rest.RestServer:60)
[2018-06-29 20:23:19,289] INFO 10.200.149.201 - - [29/Jun/2018:20:23:19 +0000]
"POST /connectors/prod-xxx-v2/tasks HTTP/1.1" 409 113 1
(org.apache.kafka.connect.runtime.rest.RestServer:60)
[2018-06-29 20:23:19,289] ERROR Request to leader to reconfigure connector
tasks failed
(org.apache.kafka.connect.runtime.distributed.DistributedHerder:1018)
org.apache.kafka.connect.runtime.rest.errors.ConnectRestException: Cannot
complete request because of a conflicting operation (e.g. worker rebalance)
at
org.apache.kafka.connect.runtime.rest.RestServer.httpRequest(RestServer.java:229)
at
org.apache.kafka.connect.runtime.distributed.DistributedHerder$18.run(DistributedHerder.java:1015)
at java.util.concurrent.Executors$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)
```
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