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https://issues.apache.org/jira/browse/KAFKA-9152?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bill Bejeck resolved KAFKA-9152.
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Resolution: Fixed
> Improve Sensor Retrieval
> -------------------------
>
> Key: KAFKA-9152
> URL: https://issues.apache.org/jira/browse/KAFKA-9152
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Bruno Cadonna
> Assignee: highluck
> Priority: Minor
> Labels: newbie, tech-debt
> Fix For: 2.5.0
>
>
> This ticket shall improve two aspects of the retrieval of sensors:
> 1. Currently, when a sensor is retrieved with {{*Metrics.*Sensor()}} (e.g.
> {{ThreadMetrics.createTaskSensor()}}) after it was created with the same
> method {{*Metrics.*Sensor()}}, the sensor is added again to the corresponding
> queue in {{*Sensors}} (e.g. {{threadLevelSensors}}) in
> {{StreamsMetricsImpl}}. Those queues are used to remove the sensors when
> {{removeAll*LevelSensors()}} is called. Having multiple times the same
> sensors in this queue is not an issue from a correctness point of view.
> However, it would reduce the footprint to only store a sensor once in those
> queues.
> 2. When a sensor is retrieved, the current code attempts to create a new
> sensor and to add to it again the corresponding metrics. This could be
> avoided.
>
> Both aspects could be improved by checking whether a sensor already exists by
> calling {{getSensor()}} on the {{Metrics}} object and checking the return
> value.
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