Amazon ElasticMapReduce(EMR) controlling split size / num of mappers

How can I change this configuration? For my application, a split size of 64/128 is too much for me,

and I would like to have a split size of 16 mb for example.

How can I do it?

Solution

You can change the default block size by setting fs.s3n.block.size. Please try like below in your code - jobConf.set("fs.s3n.block.size", value);