Shutting down the Disruptor with pending events in the buffer causes high CPU usage

[brenuart]

Calling Disruptor#shutdown() waits until all enqueued events are processed by all registered processors. This happens in a busy spin which causes a high CPU load (see https://github.com/LMAX-Exchange/disruptor/blob/3.4.4/src/main/java/com/lmax/disruptor/dsl/Disruptor.java#L451-L463).

Instead the AsyncDisruptorAppender should implement its own graceful shutdown of the Disruptor with its own wait strategy then ask for an immediate shutdown of the Disruptor when the grace period is over.