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https://issues.apache.org/jira/browse/KAFKA-9668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17053751#comment-17053751
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ASF GitHub Bot commented on KAFKA-9668:
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guozhangwang commented on pull request #8233: KAFKA-9668: Iterating over
KafkaStreams.getAllMetadata() results in ConcurrentModificationException
URL: https://github.com/apache/kafka/pull/8233
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> Iterating over KafkaStreams.getAllMetadata() results in
> ConcurrentModificationException
> ---------------------------------------------------------------------------------------
>
> Key: KAFKA-9668
> URL: https://issues.apache.org/jira/browse/KAFKA-9668
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 0.10.1.0
> Reporter: Andy Coates
> Assignee: Andy Coates
> Priority: Major
>
> `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`.
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