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97923ca3fc
This solves the problem that etcd may fatal because its critical path cannot get file descriptor resource when the number of clients is too big. The PR lets the client listener close client connections immediately after they are accepted when the file descriptor usage in the process reaches some pre-set limit, so it ensures that the internal critical path could always get file descriptor when it needs. When there are tons to clients connecting to the server, the original behavior is like this: ``` 2015/08/4 16:42:08 etcdserver: cannot monitor file descriptor usage (open /proc/self/fd: too many open files) 2015/08/4 16:42:33 etcdserver: failed to purge snap file open default2.etcd/member/snap: too many open files [halted] ``` Current behavior is like this: ``` 2015/08/6 19:05:25 transport: accept error: closing connection, exceed file descriptor usage limitation (fd limit=874) 2015/08/6 19:05:25 transport: accept error: closing connection, exceed file descriptor usage limitation (fd limit=874) 2015/08/6 19:05:26 transport: accept error: closing connection, exceed file descriptor usage limitation (fd limit=874) 2015/08/6 19:05:27 transport: accept error: closing connection, exceed file descriptor usage limitation (fd limit=874) 2015/08/6 19:05:28 transport: accept error: closing connection, exceed file descriptor usage limitation (fd limit=874) 2015/08/6 19:05:28 etcdserver: 80% of the file descriptor limit is used [used = 873, limit = 1024] ``` It is available at linux system today because pkg/runtime only has linux support.