GitHub user akonopko opened a pull request:
https://github.com/apache/spark/pull/19430
Spark 18580
## What changes were proposed in this pull request?
Add `spark.streaming.backpressure.initialRate` to direct Kafka Streams for
Kafka 0.8 and 0.10
This is required in order to be able to use backpressure with huge lags,
which cannot be processed at once. Without this parameter
`DirectKafkaInputDStream` with backpressure enabled would try to get all the
possible data from Kafka before adjusting consumption rate
## How was this patch tested?
- Tests added to
`org/apache/spark/streaming/kafka010/DirectKafkaStreamSuite.scala` and
`org/apache/spark/streaming/kafka/DirectKafkaStreamSuite.scala`
- Manual tests on YARN cluster
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/akonopko/spark SPARK-18580
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/19430.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #19430
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