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https://issues.apache.org/jira/browse/KAFKA-5244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16011053#comment-16011053
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ASF GitHub Bot commented on KAFKA-5244:
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GitHub user ijuma opened a pull request:
https://github.com/apache/kafka/pull/3059
KAFKA-5244: Refactor BrokerTopicStats and ControllerStats so that they are
classes
This removes the need to force object initialisation via hacks to register
the relevant metrics during start-up.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ijuma/kafka
kafka-5244-broker-static-stats-and-controller-stats-as-classes
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/3059.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3059
----
commit 94340b85e4095cc8dad7ed18d9c50124d400d753
Author: Ismael Juma <ism...@juma.me.uk>
Date: 2017-05-05T13:06:08Z
Refactor BrokerTopicStats and ControllerStats so that they are classes
This removes the need to force object initialisation via hacks to register
the relevant metrics during start-up.
----
> Tests which delete singleton metrics break subsequent metrics tests
> -------------------------------------------------------------------
>
> Key: KAFKA-5244
> URL: https://issues.apache.org/jira/browse/KAFKA-5244
> Project: Kafka
> Issue Type: Bug
> Components: core
> Reporter: Rajini Sivaram
> Assignee: Rajini Sivaram
> Fix For: 0.11.0.0
>
>
> Static metrics like {{BrokerTopicStats.ReplicationBytesInPerSec}} are created
> in a singleton, resulting in one metric being created in a JVM. Some tests
> like {{MetricsDuringTopicCreationDeletionTest}} delete all metrics from the
> static metrics registry. The singleton metrics don't get recreated and
> subsequent tests relying on these metrics may fail.
> Singleton metrics make testing hard - we have no idea what metrics are being
> tested. Not sure we want to change that though since there is a lot of code
> that relies on this. But we have to fix tests to ensure that metrics are left
> in a good state.
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