mjsax commented on code in PR #15975:
URL: https://github.com/apache/kafka/pull/15975#discussion_r1607621599
##########
streams/src/main/java/org/apache/kafka/streams/state/internals/metrics/StateStoreMetrics.java:
##########
@@ -144,6 +145,10 @@ private StateStoreMetrics() {}
private static final String SUPPRESSION_BUFFER_SIZE_MAX_DESCRIPTION =
MAX_DESCRIPTION_PREFIX + SUPPRESSION_BUFFER_SIZE_DESCRIPTION;
+ private static final String NUM_OPEN_ITERATORS = "num-open-iterators";
+ private static final String NUM_OPEN_ITERATORS_DESCRIPTION =
+ "The current number of Iterators on the store that have been
created, but not yet closed";
Review Comment:
```suggestion
"The current number of iterators on the store that have been
created, but not yet closed";
```
##########
streams/src/main/java/org/apache/kafka/streams/state/internals/MeteredKeyValueStore.java:
##########
@@ -162,6 +165,8 @@ private void registerMetrics() {
flushSensor = StateStoreMetrics.flushSensor(taskId.toString(),
metricsScope, name(), streamsMetrics);
deleteSensor = StateStoreMetrics.deleteSensor(taskId.toString(),
metricsScope, name(), streamsMetrics);
e2eLatencySensor =
StateStoreMetrics.e2ELatencySensor(taskId.toString(), metricsScope, name(),
streamsMetrics);
+ StateStoreMetrics.addNumOpenIteratorsGauge(taskId.toString(),
metricsScope, name(), streamsMetrics,
Review Comment:
Would it be better to add a `Sensor` that allows us to track the different
metrics in one go?
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