title: How to process the message on failure inside IEventProcessor.ProcessEvents method
body: <p>The application has an implementation of IEventProcessor. When an unhandled exception is thrown from the ProcessEventsAsync method the EventProcessorHost never re-sends those messages to the running instance of IEventProcessor. (It will re-send if the hosting application is stopped and restarted or if the lease is lost and re-obtained.)</p>
  
  <p>when an exception occurs in processEventAsync the checkpoint will not be set only if it's successful the checkpoint is set using this context.CheckpointAsync()</p>