Follow/Unfollow problem in system design
一般來說 關注和取關是如何實現的?
follow一個在使用者之後 會非同步的將其time line合併到自己的news feed中,也就是說 雖然我們可以得到立即的反饋,但是實際上如果我們立刻重新整理feed的話 實際上是無法立即顯示。
相似的情況也會出現在Unfollow一個使用者後
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