HaHelper

Need your data highly available but don't want the overheard of deploying and managing a third party database? Attach your data directly to your app! HaHelper is a client library that turns your server into a highly available data store for itself!

HaHelper stores your data and provides many configuration options to help facilitate how your data is made available.

• Easily replicate your data to tolerate node failures
• Cross Language support! Link two servers in any language!
• Listen for data changes and act on updates!
• Choose between disk-based or memory-based storage
• Configurable service discovery methods

Getting Started

To being using HaHelper, simply download the HaHelper client library for the language of your choice. Read the documentation for your language for more details about implementation.

Starting a Server

Making your server HA is as simple as starting the HAHelper server/client library.

HaHelper(HaHelperServerConfig.load()).start()

Configuration

Configuration can be provided to HaHelper in a number of ways. Using HaHelperServerConfig.load() will search the following default locations in order of priority:

• File defined at by the environment variable: HA_HELPER_CONFIG_PATH
• ./ha_helper_config.yaml
• ./config/ha_helper_config.yaml

If multiple configuration files exist, the first file found will be used. You must provide a configuration, no defaults exist.

The following configuration options are available:

cluster.discoveryMethod.knownHosts:
  - hostname: localhost
  port: 9998

Storing Data

TODO

Fetching Data

TODO

Listening for Changes

TODO