Commits on Jun 29, 2016

1. AsyncConnection: create writable event for in progress connection …

   Previously we use a tricky with ceph msgr protocol, if initiator side got
   in progress connection state, it will wait until read event. Because if
   tcp session built successfully server side will send the banner firstly
   and initiator side will get read event. Otherwise, if connection failed,
   read event also be called.
   
   But actually man(2)[http://man7.org/linux/man-pages/man2/connect.2.html]
   specify if we want to get notification whether connection built, we need
   to listen writable event. It means when connection built, send buffer
   is ready to be written.
   
   This patch follow the strict nonblock connect process. Not fully sure fix
   http://tracker.ceph.com/issues/15849
   
   Signed-off-by: Haomai Wang <haomai@xsky.com>
   (cherry picked from commit a74ce41)

   

   yuyuyu101 authored and ldachary committed Jun 29, 2016
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