Hbase物理架构
概念：
- hfile23
- compression
- split
- append,compaction
hfile
- 随机访问block:1time datablock64k+metablock约100%命中:(2time bloomblock128k+1time indexblock128k)
- KeyValue类中自带的字段占用大小约为50~60 bytes
- hfile:scanedblock,nonscanedblock,loadonopen,trailer
- rootindex二分查找/leaf/intermediate index chunk 二分查找->read hdfsblock->遍历key
split
- split序列
- split时机
- split工业场景
compaction
- append
- compaction
- compaction时机
- bulkload序列
- 高吞吐量工业场景
compression
- datablock压缩
- hdfs压缩
- prefixtree算法