build a tiny kv store base on Bitcask
tiny-bitcask是对bitcask论文的简单实现，旨在提供用Go实现简单kv存储引擎的参考。后来我想把这个项目作为实现我各种想法的试验田。所以会持续迭代这个项目，迭代的结果就是master分支的代码。如果想看简单版本的实现可以通过以下方式拉取代码，并且切换到demo分支。
git clone [email protected]:elliotchenzichang/tiny-bitcask.git
cd tiny-bitcask
git chckout demo另外我想实现做的实验和实现的想法会记录在项目TODO中。并切换分支进行相关迭代，有效果的部分会合并进入master分支。实践的相关文章会列在文章列表上。感谢各位的关注，希望各位都能从中学到一些东西。欢迎star，欢迎提PR。
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tiny-bitcask仓库的demo分支：stroage.go:121， path := fmt.Sprintf("%s/%d", s.dir, fid)是否少了文件后缀名，之后调用os.OpenFile应该会失败吧。
这里读到 entry 之后是不是检查一下是否删除状态，以及和内存中的 index 相比是不是老数据，如果是老数据的话应该就不用写入了？
好像没看到相关的判断逻辑。
https://github.com/elliotchenzichang/tiny-bitcask/blob/master/db.go#L104-L114
entry, err := db.s.readEntry(fid, off)
if err == nil {
off += int64(entry.Size())
oldIndex := db.kd.index[string(entry.key)]
if oldIndex.fid == fid && oldIndex.off == off {
newIndex, err := db.s.writeAt(entry.Encode())
if err != nil {
return err
}
db.kd.index[string(entry.key)] = newIndex
}
}
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