About Checkpoint Restart
You can use the pub.cache services to implement checkpoint restart in services that you write to make them more robust. You use the pub.cache services to write state information and other pertinent data to the cache. If the Integration Server on which your service is executing becomes unavailable, your service will be able to check the state information in the cache and resume processing at the point where the service was interrupted.
Note: The pub.cache services are a tool for maintaining state information for the short term. It is up to the developer of the services to make sure they keep track of state information and correctly handle restarts.
The following diagram shows the logic of a flow service that uses checkpoint restart.
