Steven Schlansker created KAFKA-19680:
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Summary: NoSuchElementException (again) in Kafka Streams iterator
metrics
Key: KAFKA-19680
URL: https://issues.apache.org/jira/browse/KAFKA-19680
Project: Kafka
Issue Type: Bug
Affects Versions: 4.1.0
Reporter: Steven Schlansker
Since upgrading to Kafka Streams 4.1.0, we again see in our metrics collection:
{code:java}
Exception thrown from GraphiteReporter#report. Exception was suppressed.
java.util.NoSuchElementException: null
at
java.base/java.util.concurrent.ConcurrentSkipListMap.firstKey(ConcurrentSkipListMap.java:1863)
at
java.base/java.util.concurrent.ConcurrentSkipListSet.first(ConcurrentSkipListSet.java:393)
at
org.apache.kafka.streams.internals.metrics.OpenIterators.lambda$add$0(OpenIterators.java:57)
at
org.apache.kafka.common.metrics.KafkaMetric.metricValue(KafkaMetric.java:81)
{code}
It seems that unfortunately the dynamic metric registration introduced in
[https://github.com/apache/kafka/pull/20022] undid the fix from
[https://github.com/apache/kafka/pull/18771]
There is still a race between the metric gauge being removed, and the last open
iterator being removed from the tracking set. The same fix from #18771 would
fix the issue again.
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