C0urante commented on code in PR #12281:
URL: https://github.com/apache/kafka/pull/12281#discussion_r921322234
##########
streams/src/main/java/org/apache/kafka/streams/state/internals/metrics/RocksDBMetricsRecordingTrigger.java:
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@@ -32,12 +32,12 @@ public RocksDBMetricsRecordingTrigger(final Time time) {
public void addMetricsRecorder(final RocksDBMetricsRecorder
metricsRecorder) {
final String metricsRecorderName =
metricsRecorderName(metricsRecorder);
- if (metricsRecordersToTrigger.containsKey(metricsRecorderName)) {
+ final RocksDBMetricsRecorder existingRocksDBMetricsRecorder =
metricsRecordersToTrigger.putIfAbsent(metricsRecorderName, metricsRecorder);
Review Comment:
~Does this change behavior? Potential concurrency bug aside (which I'm not
sure is actually a bug, since it's unclear if we expect this method to be
called concurrently), it looks like we're going from failing _before_
overwriting values to now failing _after_ overwriting them. Is there any
fallout from that or is it a benign change?~
Never mind, had to refresh my understanding of `Map::putIfAbsent`. This does
not change behavior.
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