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From Guozhang Wang <wangg...@gmail.com>
Subject Re: Per topic MBeans leaking
Date Fri, 13 Jan 2017 16:31:52 GMT
The way you used admin tools to create and delete topics looks reasonable
to me. I suspect there may be some race conditions causing the metrics to
not be de-registered.

Could you file a JIRA to track this issue so we can investigate?


Guozhang

On Fri, Jan 13, 2017 at 8:12 AM, <Alberto.Forti@natwestmarkets.com.invalid>
wrote:

> Hi,
>
> In our application we create and delete topics dynamically. In our
> dev/test environment, where we create and delete a lot of topics, I've
> noticed that the memory usage of the Kafka brokers slowly increases and
> then noticed the huge amount of MBeans related to topics that should have
> been deleted (e.g. kafka.server:type=BrokerTopicMetrics,name=
> TotalProduceRequestsPerSec,topic=dw_06b5f828-e452-4e22-89c9-67849a65603d).
>
> Also, deleting a topic often produces (what I think is) noise in the logs
> at WARN level, for example:
> 2017-01-13 14:52:46 WARN  PartitionStateMachine$DeleteTopicsListener:83 -
> [DeleteTopicsListener on 1]: Ignoring request to delete non-existing topics
> dw_fe8ff14b-aa9b-4f24-9bc1-6fbce15d20d2
>
> This behaviour is easy to reproduce with a basic Kafka cluster with two
> brokers, just create and delete topics few times. Sometimes the MBeans for
> the topic are deleted and sometimes not.
>
> Maybe I'm deleting the topics in the wrong way? I'm using the AdminUtils
> class in the Java API:
> AdminUtils.deleteTopic(zkUtils, topicName);
>
> Topics are created using the AdminUtils class as well:
> AdminUtils.createTopic(zkUtils, topicName, partitions, replicationFactor,
> topicConfiguration, kafka.admin.RackAwareMode.Enforced$.MODULE$);
>
> The Kafka version is 0.10.0.1.
>
> Thanks,
> Alberto
>
>
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-- 
-- Guozhang

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