I've created a PR for this. https://github.com/Alluxio/alluxio/pull/3065  Can you try that?  Personally, I think it is better to set ALLUXIO_RAM_FOLDER as a mount point since it is actually is when the ramdisk is not mounted manually. alluxio.worker.data.folder is used to set the subdir. So i think it is better to keep it. 