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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