Add snapshot IO manager #228
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* Reading a snapshot object is an expensive operation, but currently it is executed in Raft threads synchronously, which has bad impact on the overall latency of the leader. * Added an experimental option to execute snapshot IO in background asynchronously. It is managed by the newly introduced global snapshot IO manager.
* While the request in the queue is being processed, new request for the same peer shouldn't be enqueued.
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Reading a snapshot object is an expensive operation, but currently
it is executed in Raft threads synchronously, which has bad impact on
the overall latency of the leader.
Added an experimental option to execute snapshot IO in background
asynchronously. It is managed by the newly introduced global snapshot
IO manager.