libmc
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add more log for easy debug & track connection state
deps on https://github.com/douban/libmc/pull/79
Could you add more details on why we need this? I know this is good, but we need background and reasons to help us track down issues.
@mckelvin this pr add some log in info level。specially, pointer address of "this" is new。pointer address is useful to track reconnecting,host:port or alias is not enough。these logs help us discover the recv_error issue cause by server kick connections because of idle_timeout。