Cluster.Run on the thread pool

[verdie-g]

aerospike-client-csharp/AerospikeClient/Cluster/Cluster.cs

Line 301 in ba6b5a6

tendThread = new Thread(new ThreadStart(this.Run));

Currently, Cluster.Run is executed on a dedicated threads. This is not great for several reasons:

1. it's a inefficient use of resource, especially when the application is connected to many clusters
2. it involves extra context switches
3. when investigating thread pool starvation, a trace could show that Cluster.Run was the method that spent the most time blocking threads. After some time, you realize that it's a in dedicated thread so it can be ignored for the investigation.
   

What do you think about making the Aerospike client a good citizen by turning this code async and running it in the thread pool?

[shannonklaus]

I am in the process of changing the client to be async awaitable. I will keep your concerns in mind when I revisit the tendThread and Cluster.Run.