Since the sync channel with a buffer size of 0 will
become "rendezvous channel" where a try_send would return
directly with an error when its peer receiver isn't waiting
to acquire some data, and in this case there would be chance
to miss trigger client handler to create much more worker
threads to handle the request messages.
Thus, it should use "send" to block until its peer receiver is
available to hand off the message.
Since the sync channel with a buffer size of 0 will become "rendezvous channel" where a try_send would return directly with an error when its peer receiver isn't waiting to acquire some data, and in this case there would be chance to miss trigger client handler to create much more worker threads to handle the request messages.
Thus, it should use "send" to block until its peer receiver is available to hand off the message.
Signed-off-by: fupan.lfp fupan.lfp@antfin.com