[jira] [Created] (KAFKA-9472) Reducing number of tasks for connector causes deleted tasks to show as UNASSIGNED

["Chris Egerton (Jira)" <ji...@apache.org>]

Chris Egerton created KAFKA-9472:
------------------------------------

             Summary: Reducing number of tasks for connector causes deleted tasks to show as UNASSIGNED
                 Key: KAFKA-9472
                 URL: https://issues.apache.org/jira/browse/KAFKA-9472
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
    Affects Versions: 2.3.1, 2.4.0, 2.2.2, 2.2.1, 2.3.0, 2.1.1, 2.2.0, 2.1.0, 2.0.1, 2.0.0
            Reporter: Chris Egerton


If a connector is successfully created with {{t1}} running tasks and then reconfigured to use {{t1 - n}} tasks (where {{t1}} and {{n}} are both whole numbers and {{n}} is strictly less than {{t1}}), the connector should then list {{t1 - n}} total tasks in its status (which can be queried via the {{/connectors/:name:/status}} endpoint or the {{/connectors}} endpoint with the {{expand}} URL query parameter set to {{status}}).

However, the connector will instead continue to list {{t1}} total tasks in its status, with {{n}} of them being listed as {{UNASSIGNED}} and the remaining {{t1 - n}} of them being listed as {{STARTED}}.

This is because the only time a task status is removed from the status backing store (as opposed to simply being updated to {{UNASSIGNED}}) is when its connector is deleted. See relevant code snippets from the [AbstractHerder|https://github.com/apache/kafka/blob/df13fc93d0aebfe0ecc40dd4af3c5fb19b35f710/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/AbstractHerder.java#L187-L192] and [DistributedHerder|https://github.com/apache/kafka/blob/df13fc93d0aebfe0ecc40dd4af3c5fb19b35f710/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/distributed/DistributedHerder.java#L1511-L1520] classes.



--
This message was sent by Atlassian Jira
(v8.3.4#803005)