Comment #9 on issue 106 by [email protected]: binary protocol parsing can
cause memcached server lockup
http://code.google.com/p/memcached/issues/detail?id=106
The recvfom() use 0 as SIZE and NULL as BUFFER. According to manual, that
call will consume the incoming packet. Without it, epoll_wait() will always
return immediately because the UDP socket is still in readable state.
-- Function: int recvfrom (int SOCKET, void *BUFFER, size_t SIZE, int
FLAGS, struct sockaddr *ADDR, socklen_t *LENGTH-PTR)
The `recvfrom' function reads one packet from the socket SOCKET
into the buffer BUFFER. The SIZE argument specifies the maximum
number of bytes to be read.
If the packet is longer than SIZE bytes, then you get the first
SIZE bytes of the packet and the rest of the packet is lost.
There's no way to read the rest of the packet. Thus, when you use
a packet protocol, you must always know how long a packet to
expect.
