Github user JasonMWhite commented on the pull request:
https://github.com/apache/spark/pull/10089#issuecomment-185478351
I added unit tests for `maxMessagesPerPartition` to cover 3 edge cases that
have been raised here:
- when backpressure is disabled, simply uses the `maxRatePerPartition`
- when there is no lag, returns `None`
- when backpressure calculations returns higher than `maxRatePerPartition`,
respects `maxRatePerPartition`
The normal test, using the fake kafka test data, exercises
`maxMessagePerPartition` in the normal case, i.e. backpressure is enabled,
there is lag, backpressure is lower than the max rate per partition.
I've also moved the MimaExcludes to the 2.0 section.
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