cadonna commented on a change in pull request #9696:
URL: https://github.com/apache/kafka/pull/9696#discussion_r538129015
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File path:
streams/src/main/java/org/apache/kafka/streams/processor/internals/metrics/StreamsMetricsImpl.java
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@@ -235,11 +235,12 @@ public final Sensor threadLevelSensor(final String
threadId,
final String key = threadSensorPrefix(threadId);
synchronized (threadLevelSensors) {
final String fullSensorName = key + SENSOR_NAME_DELIMITER +
sensorName;
- return Optional.ofNullable(metrics.getSensor(fullSensorName))
- .orElseGet(() -> {
- threadLevelSensors.computeIfAbsent(key, ignored -> new
LinkedList<>()).push(fullSensorName);
- return metrics.sensor(fullSensorName, recordingLevel,
parents);
- });
+ final Sensor sensor = metrics.getSensor(fullSensorName);
+ if (sensor == null) {
+ threadLevelSensors.computeIfAbsent(key, ignored -> new
LinkedList<>()).push(fullSensorName);
Review comment:
The number of elements is not always 1. Each created thread-level sensor
is added to this queue, e.g., `processLatencySensor`, `pollRecordsSensor`, etc.
Check out the callers of `threadLevelSensor()`.
Each queue contains all thread-level sensors for one single stream thread.
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