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                # 內存鎖定檢查 原文鏈接 : [https://www.elastic.co/guide/en/elasticsearch/reference/current/_memory_lock_check.html](https://www.elastic.co/guide/en/elasticsearch/reference/current/_memory_lock_check.html) 譯文鏈接 : [http://www.apache.wiki/pages/viewpage.action?pageId=9406708](http://www.apache.wiki/pages/viewpage.action?pageId=9406708) 貢獻者 : [阿叩](/display/~luanqing),[ApacheCN](/display/~apachecn),[Apache中文網](/display/~apachechina) ## 內存鎖定檢查 當JVM的主垃圾回收器檢查堆的每一頁時,如果其中任何一頁被交換到磁盤那它不得不重新交換回內存,這會導致大量的磁盤抖動,Elasticsearch寧愿做大量的服務請求。有一些方法可以配置系統不允許交換,一種方法是鎖定JVM堆內存,Unix通過`mlockall`,Windows通過虛擬鎖。這可以通過Elasticsearch的[bootstrap.memory_lock](https://github.com/aqlu/elasticsearch-reference-cn/blob/master/Setup_Elasticsearch/Important_Elasticsearch_configuration.md#bootstrap-memory_lock)來配置。但是,Elasticsearch不能鎖定堆(譬如elasticsearch用戶沒有`memlock`權限)的這種場景能夠被檢查通過。內存鎖定檢查校驗是否開啟了`bootstrap.memory_lock`設置,這樣JVM將成功鎖定的內存。要通過此項檢查,你需要配置[mlockall](https://github.com/aqlu/elasticsearch-reference-cn/blob/master/Setup_Elasticsearch/Important_System_Configuration/Disable_swapping.md#mlockall)。
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