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                ``` 不需特殊關注。 我們可以在發送消息時,指定消息的權重,broker可以建議權重較高的消息將會優先發送給Consumer。在某些場景下,我們通常希望權重較高的消息優先傳送;不過因為各種原因,priority并不能決定消息傳送的嚴格順序(order)。 JMS標準中約定priority可以為0~9的整數數值,值越大表示權重越高,默認值為4。不過activeMQ中各個存儲器對priority的支持并非完全一樣。比如JDBC存儲器可以支持0~9,因為JDBC存儲器可以基于priority對消息進行排序和索引化;但是對于kahadb/levelDB等這種基于日志文件的存儲器而言,priority支持相對較弱,只能識別三種優先級(LOW: < 4,NORMAL: =4,HIGH: > 4 ```
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