redis.net master/slave data synchro

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Redis

I use master/slave patter in my C#.net project.I have a problem now.I writen a hashset int master,and read the hashset from slave immediately.The data is wrong.eg.I writen 1000 data in the hashset,but only 800 get.but i can get 1000 data sooner.
How i can solve this problem.I need your help,thank!