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https://issues.apache.org/jira/browse/KAFKA-1087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13794791#comment-13794791
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Guozhang Wang commented on KAFKA-1087:
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Great find. +1
PS: Shall we actually enforce topic list as required parameters also besides
this fix?
> Empty topic list causes consumer to fetch metadata of all topics
> ----------------------------------------------------------------
>
> Key: KAFKA-1087
> URL: https://issues.apache.org/jira/browse/KAFKA-1087
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.8
> Reporter: Swapnil Ghike
> Assignee: Swapnil Ghike
> Attachments: KAFKA-1087.patch
>
>
> The ClientUtils fetches metadata for all topics if the topic set is empty.
> If the topic list of a consumer is empty, the following happens if a
> rebalance is triggered:
> - The fetcher is restarted, fetcher.startConnections() starts a
> LeaderFinderThread
> - LeaderFinderThread waits on a condition
> - fetcher.startConnections() signals the aforementioned condition
> - LeaderFinderThread obtains metadata for all topics since the topic list is
> empty.
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