Mc doc #985
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split tera.h to several roles baidu#964
doc/multi_thread.md
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| #compact优化——多线程compact | |||
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文件名改一下吧，multi_thread范围太大了，重点应该是compact |
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| #compact优化——多线程compact | ||
| ##背景 | ||
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| leveldb的compact策略是采用单线程执行的，顺序的读写逻辑减少了磁盘抖动，有利于发挥单机的机械磁盘的高效顺序读写性能。而类似rocksdb和tera的使用场景，底层直接使用ssd或使用ssd做本地cache或使用分布式文件系统，突破了机械磁盘的限制，在这种场景下，tera目前仍然使用levelbd的单线程模型做compact，业务的写热点很容易导致写入失败。因此本次实现多线程compact，充分利用底层存储带宽，提升compact性能，保证写分裂前，不会因为写热点导致写失败。 |
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磁盘抖动是啥。。大致明白你意思，不过好像没这个专业术语？
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#976