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https://issues.apache.org/jira/browse/SPARK-19564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15862847#comment-15862847
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Apache Spark commented on SPARK-19564:
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User 'lw-lin' has created a pull request for this issue:
https://github.com/apache/spark/pull/16900
> KafkaOffsetReader's consumers should not be in the same group
> -------------------------------------------------------------
>
> Key: SPARK-19564
> URL: https://issues.apache.org/jira/browse/SPARK-19564
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.1.1, 2.2.0
> Reporter: Liwei Lin
> Priority: Minor
>
> In `KafkaOffsetReader`, when error occurs, we abort the existing consumer and
> create a new consumer. In our current implementation, the first consumer and
> the second consumer would be in the same group, which violates our intention
> of the two consumers not being in the same group.
> The cause is that, in our current implementation, the first consumer is
> created before `groupId` and `nextId` are initialized in the constructor.
> Then even if `groupId` and `nextId` are increased during the creation of that
> first consumer, `groupId` and `nextId` would still be initialized to default
> values in the constructor.
> We should make sure that `groupId` and `nextId` are initialized before any
> consumer is created.
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