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https://issues.apache.org/jira/browse/KAFKA-19679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18019284#comment-18019284
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Matthias J. Sax commented on KAFKA-19679:
-----------------------------------------
[~stevenschlansker] – Can you test the fix and verify if it does work as
expected, and let us know?
> NoSuchElementException (again) in Kafka Streams iterator metrics
> ----------------------------------------------------------------
>
> Key: KAFKA-19679
> URL: https://issues.apache.org/jira/browse/KAFKA-19679
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 4.1.0
> Reporter: Steven Schlansker
> Assignee: Nikita Shupletsov
> Priority: Minor
> Fix For: 4.2.0, 4.1.1
>
>
> Since upgrading to Kafka 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}
> I think unfortunately the dynamic registration introduced in KAFKA-19398
> ([https://github.com/apache/kafka/pull/20022]) might have reverted the fix
> from [https://github.com/apache/kafka/pull/18771]
> There is still a race between removing the metric gauge, and the last
> iterator being removed from the tracking set.
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