Is this guide still valid now

[dongb0]

If it serves as a develop guide, then I do not expect to see so many missing/empty chapters and it lags behind tikv's documents;
If it aims to provide some implement details for those who are interested in tikv, I hope it contains some up-to-date information like "this feature is implemented in tikv vertion x.x.x and after", "it will be implemented a few version later", "it is not supported after version y.y.y", so that I know whether I need to finish remaining contents;

[pingyu]

Hi @dongb0 , thanks for your attention.

It is expected to serve as a guide for TiKV development. But it is far from finished now, and there is a lack of contributors to write the chapters.

That will be much appreciated if you would like to pick some issues, and let us finish this guide together.

And I think your last suggestion is great. When we add or update content of a chapter, we should also refer to the related TiKV version.