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https://issues.apache.org/jira/browse/KAFKA-10012?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson resolved KAFKA-10012.
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Fix Version/s: 2.6.0
Resolution: Fixed
> Reducing memory overhead associated with strings in MetricName
> --------------------------------------------------------------
>
> Key: KAFKA-10012
> URL: https://issues.apache.org/jira/browse/KAFKA-10012
> Project: Kafka
> Issue Type: Improvement
> Components: network
> Reporter: Navina Ramesh
> Assignee: Navina Ramesh
> Priority: Major
> Fix For: 2.6.0
>
>
> {{SelectorMetrics}} has a per-connection metrics, which means the number of
> {{MetricName}} objects and the strings associated with it (such as group name
> and description) grows with the number of connections in the client. This
> overhead of duplicate string objects is amplified when there are multiple
> instances of kafka clients within the same JVM.
> This patch address some of the memory overhead by making {{metricGrpName}} a
> constant and introducing a new constant {{perConnectionMetricGrpName}}.
> Additionally, the strings for metric name and description in {{createMeter}}
> have been interned since there are about 8 per-client and 4 per-connection
> {{Meter}} instances.
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