[jira] [Created] (KAFKA-9152) Improve Sensor Retrieval

["Bruno Cadonna (Jira)" <ji...@apache.org>]

Bruno Cadonna created KAFKA-9152:
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             Summary: 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


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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