From the project page:
The main goal is data availability and data persistency. We created grape for those who can not afford losing data.
Instead of going over Storm’s steps we dramatically changed Grape logic.
Contrary to Kafka we can not lose your data if ‘data-file’ was not read for a long time or its size overflows under constant write load.
Original title and link: Grape - a realtime processing pipeline ( ©myNoSQL)