This folder contains SLASH, the research prototype implementation of Serverless Apache Spark Hub. To make it run, install the dependencies for OpenStack access, e.g.: % sudo apt-get install python3-novaclient SLASH consists of three components: The Python module 'slash' which augments 'pyspark' magically with reactive autoscaling capabilities, the 'slashhub' which collects on-demand scaling actions to calculate reactive autoscaling in conjunction with predictive ones, and the 'slashjobserver' which executes the calendar scheduling and forecasting. A calendar file is expected as 'calendar' with dates or date ranges per line. Furthermore, the functionality is determined by environment variables: OS_* (see openstackclient.py for a list) and SLASH pointing 'slash' to the node running 'slashhub' on port 11111.