Ping Yu comments

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                                            Ping Yu

Use new gc safepoint update interface

Still get & pass `revision` to update GC safe point interface. _p.s. In this scenario, `revision` will be `-1._

Use new gc safepoint update interface

> @pingyu What `revision` is returned from `GetGCMinServiceSafePointByServiceGroup` interface in this scenario? `-1`. See [here](https://github.com/AmoebaProtozoa/pd/blob/2965b74dfbd1fd7a8ac9ddef94acb4c5040d5832/server/storage/kv/kv.go#L17). > Could gc-worker pass the returned `revision` to `UpdateGCSafePointByServiceGroup` or need hard code to `-1`?...

Write down the first version of RocksDB

@tisonkun I want to write this chapter. Please assign to me, thanks~

Write down the first version of IO Rate Limiter

References: [TiKV IO rate limiter - Spec](https://docs.google.com/document/d/1Jdsi7Ah1YtlZ3trCenqOL3BQ0FyeeubPJwyGwPeUdXM/edit?usp=sharing) [TiKV IO rate limiter - phase 1](https://github.com/tikv/tikv/issues/9156)

Is this guide still valid now

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...