Redis分佈式鎖注意點

原創 cap423654 2020-07-08 06:59

  • 死鎖

爲了防止死鎖，必須設置過期時間

例如：線程A拿到鎖，還沒有解鎖，程序突然掛掉，鎖一直存在，其他線程一直拿不到鎖。所以要設置過期時間

  • 加鎖跟解鎖必須是同一個線程，保證原子性

例如：線程A拿到鎖，業務還沒有處理完成，鎖已經超時被自動刪除掉了；

線程B拿到鎖，線程A解鎖的時候必須判斷值是當前線程，否則刪掉線程B的鎖。

 

可重入鎖和鎖的原子性，可以用到ThreadLocal保證當前線程的值

 

 

 

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