lucasliang comments

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                                            lucasliang

Bump version tag to `6.3.0`, in branch `release-6.3`

/cc @lijie0123

engine: upgrade raft-engine to support log recycling

Hold on. The version specification of RaftEngine lib should be update after the new version of RaftEngine is released.

engine: upgrade raft-engine to support log recycling

/cc @tabokie thanks for reviewing.

engine: upgrade raft-engine to support log recycling

@ti-chi-bot /retest

Upgrade RaftEngine to support `Recycle Logs` feature for better `write` performance.

RaftEngine lib is currently redirected to `master` branch for accepting newest feature, waited to be modified with the newest releasing tag of RaftEngine lib.

tikv: enable async-io by setting `raftstore.store-io-pool-size == 1` as default.

/cc @qiancai

tikv: enable async-io by setting `raftstore.store-io-pool-size == 1` as default.

> Hi @LykxSassinator, may I know whether this change is introduced starting from TiDB v8.0? Yep

tikv: enable async-io by setting `raftstore.store-io-pool-size == 1` as default.

/cc @glorv

transfer leader too slow when inject one of tikv io delay with “evict-slow-trend-scheduler” or “evict-slow-store-scheduler”

Root cause：too much cost on transferring leader, resulting in too-long scheduling. Referring: 1. PD scheduler details: ![350ab475-1ea1-4e3a-84aa-a2feb1d676d5](https://github.com/tikv/tikv/assets/18441614/cc02e71b-939b-42b0-93ff-fd7da82ef074) 2. PD logging on slow transferring leaders: ![46f0517d-12cb-4668-843d-0e95d9684049](https://github.com/tikv/tikv/assets/18441614/d05f72d5-8a6d-482c-a9bd-f28118492866) FYI, in general, in synchronous...

High apply wait tail latency

Wait for enhancements in the later work.