Github user zsxwing commented on the issue:
https://github.com/apache/spark/pull/15387
> but polling ordinarily consumes messages and adjusts position.
Even if `enable.auto.commit` is `false`? In the doc, it says `automatically
set as the last committed offset`, so I guess setting `enable.auto.commit` to
`false` will prevent positions from updating.
```
* On each poll, consumer will try to use the last consumed offset as
the starting offset and fetch sequentially. The last
* consumed offset can be manually set through {@link
#seek(TopicPartition, long)} or automatically set as the last committed
* offset for the subscribed list of partitions
```
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