[jira] [Assigned] (KAFKA-4441) Kafka Monitoring is incorrect during rapid topic creation and deletion

["Edoardo Comar (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-4441?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Edoardo Comar reassigned KAFKA-4441:
------------------------------------

    Assignee: Edoardo Comar

> Kafka Monitoring is incorrect during rapid topic creation and deletion
> ----------------------------------------------------------------------
>
>                 Key: KAFKA-4441
>                 URL: https://issues.apache.org/jira/browse/KAFKA-4441
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.10.0.0, 0.10.0.1
>            Reporter: Tom Crayford
>            Assignee: Edoardo Comar
>            Priority: Minor
>
> Kafka reports several metrics off the state of partitions:
> UnderReplicatedPartitions
> PreferredReplicaImbalanceCount
> OfflinePartitionsCount
> All of these metrics trigger when rapidly creating and deleting topics in a tight loop, although the actual causes of the metrics firing are from topics that are undergoing creation/deletion, and the cluster is otherwise stable.
> Looking through the source code, topic deletion goes through an asynchronous state machine: https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/controller/TopicDeletionManager.scala#L35.
> However, the metrics do not know about the progress of this state machine: https://github.com/apache/kafka/blob/trunk/core/src/main/scala/kafka/controller/KafkaController.scala#L185 
> I believe the fix to this is relatively simple - we need to make the metrics know that a topic is currently undergoing deletion or creation, and only include topics that are "stable"



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