[KAFKA-9668] Iterating over KafkaStreams.getAllMetadata() results in ConcurrentModificationException - ASF JIRA

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Details

Type: Bug
Status: Resolved
Priority: Major
Resolution: Fixed
Affects Version/s: 0.10.1.0
Fix Version/s: 2.5.0
Component/s: streams
Labels:
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Description

`KafkaStreams.getAllMetadata()` returns `StreamsMetadataState.getAllMetadata()`. All the latter methods is `synchronized` it returns a reference to internal mutable state. Not only does this break encapsulation, but it means any thread iterating over the returned collection when the metadata gets rebuilt will encounter a `ConcurrentModificationException`.