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mdrill实时数据源之索引结构 #45

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muyannian opened this issue Oct 14, 2013 · 0 comments

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muyannian commented Oct 14, 2013

索引分为两种，本地索引和内存索引
索引根据是否对外提供服务分3总类型 A类表示可以只读，B类表示可写，C表示临时

对外提供读的服务索引如下
Index 1 A
Index 2 A
Index N A
RAM A

提供写服务的索引如下
RAM B

当B体积增加到阈值或超过设定时间后
RAM A + RAM B =>RAM C
然后 RAM B to clear,RAM A=RAM C

当RAM A增加到一定体积后
RAM A+INDEX N A=>INDEX C
然后清理RAM A,INDEX N A，然后INDEX C转换为INDEX A

当INDEX N的N超过设定阈值后，借助INDEX C 合并最小的两个INDEX为新的INDEX

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