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What problem does this PR solve?
Issue Number:
Problem Summary:
目前brpc会将连接池里空闲的连接关闭,这样对于比较低频的rpc来说,如果rpc周期大于FLAGS_idle_timeout_second,那每次都要新建连接,不太友好。
What is changed and the side effects?
Changed:
支持连接池保留至少一个空闲连接。
Side effects:
Performance effects(性能影响):
Breaking backward compatibility(向后兼容性):
Check List: