Oleksii Diagiliev

Travis has upgraded the default version of installed java from 8 to 11. This caused an issue with the build, see [here](https://travis-ci.org/RedisLabs/spark-redis/builds/568016079?utm_source=github_status&utm_medium=notification).

The request came up from https://stackoverflow.com/questions/56679474/how-to-set-maximum-batch-size-of-spark-readstream-in-structured-streaming > I am reading batch record from redis using spark-structured-streaming foreachBatch by following code (trying to set the batchSize by stream.read.batch.size) > > val...

There is quite a lot of logic and corner cases in RedisRDD.scaleHostsWithPartitionNum(). We should add proper unit and maybe integration tests for it. Please make sure it covers issues like...