EAGAIN / EWOULDBLOCK Error #44
Description
A user running v2.1.5 of the DataStax Ruby driver encountered a 'write would block' error message when communicating with a node. We believe the underlying error is an EAGAIN or EWOULDBLOCK when attempting to write to the socket.
Looking at the ione code (v1.2.0 for C* driver 2.1.5), I don't see how we could end up with that error -- writes seem rely strictly on select returning a write-fd-set, so if the fd isn't writable, it shouldn't get a write attempt.
Nonetheless, it seems like in some cases it does get this error, so ione should catch it and drop it. Presumably a later write attempt will succeed as time elapses and the kernel buffer for the socket gradually empties.