Should round-robin node selection take into account queued calls?

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调研方向

从 RemotingOkHttpClient.redirectToNewRequest 开始,检查它如何访问 dispatcher 以及如何选择节点。确定队列饱和时的预期行为,并记录一项达成一致的节点选择策略;完成条件是确定设计,并验证其对跨多个节点的调用所产生的影响。

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描述

OKHttp defines a maximum number of concurrent calls per host. This is currently set to 64. If I have a multi-node service where one of the nodes is performing poorly, I can run into a situation where - even with round-robin as my node selection strategy - I end up making calls to a node that become queued up, even if those calls could have been dispatched to other nodes much more quickly.

I've seen instances of this where at any given time I'll have 64 running threads for calls to one node (with hundreds queued up) and only single-digit threads for calls to other nodes. RemotingOkHttpClient.redirectToNewRequest would be able to take into account the queue (since it has access to the dispatcher) - what do you think of supplying a new node selection strategy that takes that queue saturation into account?

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