[zeromq-dev] Can drop the first message when high water mark has been reached with socket ROUTER ?

[linkman2002 at sina.com]

Hello all:    When high water mark has been reached with socket ROUTER, the newest message will droped.     Can I change this behaviour, but drop the first buffered  message?    If can not, how can I  reach this goal？  thanks,Linkman 2016/3/25 
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