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https://issues.apache.org/jira/browse/FLINK-8306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16320339#comment-16320339
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ASF GitHub Bot commented on FLINK-8306:
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Github user pnowojski commented on the issue:
https://github.com/apache/flink/pull/5200
Regarding the race condition. I think we meant the same thing or maybe I
misunderstood part of the code, but yes, this NPE seems like a possible outcome
of this race condition.
If you have spare cycles to fix this race feel free to do so, I would like
to avoid working on it in this and the following week because of some code
handing over before some lengthy vacation in my team.
> FlinkKafkaConsumerBaseTest has invalid mocks on final methods
> -------------------------------------------------------------
>
> Key: FLINK-8306
> URL: https://issues.apache.org/jira/browse/FLINK-8306
> Project: Flink
> Issue Type: Bug
> Components: Kafka Connector, Tests
> Reporter: Tzu-Li (Gordon) Tai
> Assignee: Tzu-Li (Gordon) Tai
> Priority: Critical
> Fix For: 1.5.0, 1.4.1
>
>
> The {{FlinkKafkaConsumerBaseTest}} has invalid mocks on a final
> {{AbstractFetcher::commitInternalOffsetsToKafka(...)}} method. While an easy
> fix would be to simply make that method non-final, that is not ideal since it
> would be best that the method is left final to prevent overrides in
> subclasses.
> This suggests that offset committing functionality is too tightly coupled
> with the {{AbstractFetcher}}, making it hard to perform concise tests to
> verify offset committing.
> I suggest that we decouple record fetching and offset committing as separate
> services behind different interfaces. We should introduce a new interface,
> say {{KafkaOffsetCommitter}}, and test against that instead. Initially, we
> can simply let {{AbstractFetcher}} implement {{KafkaOffsetCommitter}}.
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