Konstantine Karantasis created KAFKA-5736:
---------------------------------------------
Summary: Improve error message in Connect when all kafka brokers
are down
Key: KAFKA-5736
URL: https://issues.apache.org/jira/browse/KAFKA-5736
Project: Kafka
Issue Type: Bug
Components: KafkaConnect
Affects Versions: 0.11.0.0
Reporter: Konstantine Karantasis
Assignee: Konstantine Karantasis
Fix For: 0.11.0.1
Currently when all the Kafka brokers are down, Kafka Connect is failing with a
pretty unintuitive message when it tries to, for instance, reconfigure tasks.
Example output:
{code:java}
[2017-08-15 19:12:09,959] ERROR Failed to reconfigure connector's tasks,
retrying after backoff:
(org.apache.kafka.connect.runtime.distributed.DistributedHerder)
java.lang.IllegalArgumentException: CircularIterator can only be used on
non-empty lists
at
org.apache.kafka.common.utils.CircularIterator.<init>(CircularIterator.java:29)
at
org.apache.kafka.clients.consumer.RoundRobinAssignor.assign(RoundRobinAssignor.java:61)
at
org.apache.kafka.clients.consumer.internals.AbstractPartitionAssignor.assign(AbstractPartitionAssignor.java:68)
at
... (connector code)
at
org.apache.kafka.connect.runtime.Worker.connectorTaskConfigs(Worker.java:230)
{code}
The error message needs to be improved, since its root cause is the absence
kafka brokers for assignment.
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