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License: MIT License
bitcask in rust
License: MIT License
一次性merge需要内存可以同时容纳两个hashmap,分段merge可以提高内存利用率
避免一个目录内有过多文件的问题
拆成两个 hashmap : older_hashmap 和 active_hashmap。segment 也分为 older_segments 和 active_segment 。
compact 的时候只对 older_segments 根据 older_hashmap 判断是否是最新值,并返回新的 compact 以后的 hashmap。用这个 hashmap 替换 older_hashmap
生成 hint 文件
标记删除的标示需要 escape
active_data 和 older_data 的 key 没有去重
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