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https://issues.apache.org/jira/browse/KAFKA-19680?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steven Schlansker resolved KAFKA-19680.
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Resolution: Duplicate
> 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
> Priority: Minor
>
> 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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