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https://issues.apache.org/jira/browse/KAFKA-2335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14628323#comment-14628323
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Ewen Cheslack-Postava commented on KAFKA-2335:
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Good catch, it seems we missed on reference to thread safety in KAFKA-2168.
You're right that the intended behavior is to not be thread safe, so the
earlier statement should be removed or updated.
> Javadoc for Consumer says that it's thread-safe
> -----------------------------------------------
>
> Key: KAFKA-2335
> URL: https://issues.apache.org/jira/browse/KAFKA-2335
> Project: Kafka
> Issue Type: Bug
> Reporter: Ismael Juma
>
> This looks like it was left there by mistake:
> {quote}
> * The consumer is thread safe but generally will be used only from within a
> single thread. The consumer client has no threads of it's own, all work is
> done in the caller's thread when calls are made on the various methods
> exposed.
> {quote}
> A few paragraphs below it says:
> {quote}
> The Kafka consumer is NOT thread-safe. All network I/O happens in the thread
> of the application making the call. It is the responsibility of the user to
> ensure that multi-threaded access is properly synchronized. Un-synchronized
> access will result in {@link ConcurrentModificationException}.
> {quote}
> This matches what the code does, so the former quoted section should probably
> be deleted.
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