[jira] [Created] (KAFKA-14316) NoSuchElementException in feature control iterator

["Jason Gustafson (Jira)" <ji...@apache.org>]

Jason Gustafson created KAFKA-14316:
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             Summary: NoSuchElementException in feature control iterator
                 Key: KAFKA-14316
                 URL: https://issues.apache.org/jira/browse/KAFKA-14316
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 3.3.0
            Reporter: Jason Gustafson
            Assignee: Jason Gustafson


We noticed this exception during testing:
{code:java}
java.util.NoSuchElementException
2	at org.apache.kafka.timeline.SnapshottableHashTable$HistoricalIterator.next(SnapshottableHashTable.java:276)
3	at org.apache.kafka.timeline.SnapshottableHashTable$HistoricalIterator.next(SnapshottableHashTable.java:189)
4	at org.apache.kafka.timeline.TimelineHashMap$EntryIterator.next(TimelineHashMap.java:360)
5	at org.apache.kafka.timeline.TimelineHashMap$EntryIterator.next(TimelineHashMap.java:346)
6	at org.apache.kafka.controller.FeatureControlManager$FeatureControlIterator.next(FeatureControlManager.java:375)
7	at org.apache.kafka.controller.FeatureControlManager$FeatureControlIterator.next(FeatureControlManager.java:347)
8	at org.apache.kafka.controller.SnapshotGenerator.generateBatch(SnapshotGenerator.java:109)
9	at org.apache.kafka.controller.SnapshotGenerator.generateBatches(SnapshotGenerator.java:126)
10	at org.apache.kafka.controller.QuorumController$SnapshotGeneratorManager.run(QuorumController.java:637)
11	at org.apache.kafka.controller.QuorumController$ControlEvent.run(QuorumController.java:539)
12	at org.apache.kafka.queue.KafkaEventQueue$EventContext.run(KafkaEventQueue.java:121)
13	at org.apache.kafka.queue.KafkaEventQueue$EventHandler.handleEvents(KafkaEventQueue.java:200)
14	at org.apache.kafka.queue.KafkaEventQueue$EventHandler.run(KafkaEventQueue.java:173)
15	at java.base/java.lang.Thread.run(Thread.java:833)
16	at org.apache.kafka.common.utils.KafkaThread.run(KafkaThread.java:64) {code}
The iterator `FeatureControlIterator.hasNext()` checks two conditions: 1) whether we have already written the metadata version, and 2) whether the underlying iterator has additional records. However, in `next()`, we also check that the metadata version is at least high enough to include it in the log. When this fails, then we can see an unexpected `NoSuchElementException` if the underlying iterator is empty.

 



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