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Posted to dev@kafka.apache.org by "Jose Armando Garcia Sancio (Jira)" <ji...@apache.org> on 2019/10/25 00:07:00 UTC

[jira] [Created] (KAFKA-9100) The controller code allows for replicas to get added to the assignment when the replicas goes online

Jose Armando Garcia Sancio created KAFKA-9100:
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             Summary: The controller code allows for replicas to get added to the assignment when the replicas goes online
                 Key: KAFKA-9100
                 URL: https://issues.apache.org/jira/browse/KAFKA-9100
             Project: Kafka
          Issue Type: Task
          Components: controller
    Affects Versions: 2.3.0
            Reporter: Jose Armando Garcia Sancio
            Assignee: Jose Armando Garcia Sancio


The controller code when modelling the replicas state machine allows for a replica to be added to assignment when going online from a new state. This should not be possible.

Replicas are added to a partition when creating a topic, creating a partition or reassigning a partition. Whether a replica goes online should not cause a replica to get added to the assignment.

The code that currently allows this is here: https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/controller/ReplicaStateMachine.scala#L194-L198

We should restructure the code so that that condition is not possible.



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