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使用mongodb3.0.0 引擎wiredTiger,mongostat监控，间歇性(5分钟内)出现aw数量增加很多，导致系统堵住。请问这个aw具体是什么含义，什么原因会导致该问题？
光阴似箭催人老，日月如移越少年。
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光阴似箭催人老，日月如移越少年。