Liwei Lin created SPARK-19564:
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Summary: 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 the
creation of the any consumer.
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