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                [TOC] # 版本沖突 ![](https://box.kancloud.cn/7fa2834cdcdef96f82ee7b3a4eb3b1db_890x421.png) es用的是樂觀并發控制 外部版本指的是mysql這樣的,他要求mysql版本號和es相等有點不現實,就要求比他大就行 還有些是用時間戳做version # 事務日志 ![](https://box.kancloud.cn/eec767f6d14037e6c7567f8b849b1bb2_484x358.png) translog就是事務日志 ![](https://box.kancloud.cn/04413430abb44f73da79acffeec22918_988x375.png) ![](https://box.kancloud.cn/14689a3b3f65403e8226f34d05f97cc9_1730x808.png) flush api ![](https://box.kancloud.cn/0dc2d6ef218f17097495c1af0cf65d72_900x270.png) # 故障探測 有master節點和date node階段的探測 他們會互相探測的,就是互相ping ![](https://box.kancloud.cn/7632b8eb64e5011dbb80f691a2c134e9_995x447.png) ping_retries是重試幾次 ping_timeout是ping超時 ## master故障 ![](https://box.kancloud.cn/03b255dd791d476c5792a33be5da81b9_665x283.png) 有可能造成腦裂 ![](https://box.kancloud.cn/c2c89bd64cac139d71718a71ef53cf11_847x284.png) ## datenode節點 如果master節點ping3次ping不通,會把這個data node給剔除 ![](https://box.kancloud.cn/380e5517d384de626b5d606f75f74509_936x352.png) ![](https://box.kancloud.cn/b6f01ea5440d5a0e22a96f306f571317_728x719.png)
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