Haura

This book is dedicated as a Getting Started or Developer Guide to the Haura research storage stack. We give you here a quick overview of how Haura is used and its basic structure. If you are intereted in any of the specific parts and functions of the project navigate in the "Structure" menu on the left to your desired section.

Haura works different from file system such as ext4 or btrfs which would run in the kernel. Haura only runs in the userspace and is not designed to be permanently active nor provide usual interfaces like POSIX. Rather you use a key-value and object interface common to databases and mass storage applications.

Below we lay out two scenarios which show how Haura is commonly used in conjunction with any arbitrary client code.

Scenario 1 - Using Haura directly

The simplest way to use Haura, as you will also see in the examples, is the direct initialization of Haura with your own configuration. This will let Haura run in your own process context meaning that with the termination of your program Haura will be stopped as well.

Scenario 2 - Using a Wrapper

Using a wrapper around the functionality like JULEA will allow for more flexible usage of the storage stack as the JULEA process will own and run the Haura instance, meaning that the storage stack will surpass the lifetime of an application process. Additionally, this allows for more than one client to be connected to an active Haura instance.