Ruihao Chen

[DNM]*: test branch

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### What problem does this PR solve? Issue Number: close #xxx Problem Summary: ### What changed and how does it work? ### Check List Tests - [x] Unit test -...

lightning: refine the error message of lightning `DiskQuota` precheck

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## Enhancement Currently, during the precheck phase, if the disk capacity is less than disk quota, precheck will failed. But the error message is a bit misleading: ``` +----+------------------------------------------------------------------------------------------------------------------------------------+-------------+--------+ |...

lightning: change the implementation of `ScannedPos`

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### What problem does this PR solve? Issue Number: ref https://github.com/pingcap/tidb/issues/61088 Problem Summary: ### What changed and how does it work? In the encode step, we will track the amount...

Tracking issue for cherry-pick from sync-diff-inspector

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As we want to move sync_diff_inspector to tiflow repo, we have to sync all the PRs in tidb-tools to tiflow first.

Update description of `MAX_WRITE_SPEED`

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### First-time contributors' checklist - [x] I've signed [**Contributor License Agreement**](https://cla-assistant.io/pingcap/docs-cn) that's required for repo owners to accept my contribution. ### What is changed, added or deleted? (Required) ### Which...

Update description of `MAX_WRITE_SPEED`

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### First-time contributors' checklist - [x] I've signed [**Contributor License Agreement**](https://cla-assistant.io/pingcap/docs) that's required for repo owners to accept my contribution. ### What is changed, added or deleted? (Required) ### Which...

ddl, model: fix unexpected missing analyze for multi schema change

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### What problem does this PR solve? Issue Number: ref https://github.com/pingcap/tidb/issues/63366 Problem Summary: If the last sub job in the multi schema change doesn't need reorg (i.e., no index involved),...

ddl: refine the criterion for modify column

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### What problem does this PR solve? Issue Number: ref https://github.com/pingcap/tidb/issues/63366 Problem Summary: ### What changed and how does it work? Disable lossy modify column optimization in the following cases:...

*: backport dynamic parameter change for DXF add index to 8.5

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### What problem does this PR solve? Issue Number: ref https://github.com/pingcap/tidb/issues/57497, close #64947 Problem Summary: Manually pick dynamic parameter change related PR, including - All PRs in https://github.com/pingcap/tidb/pull/62083 - https://github.com/pingcap/tidb/pull/57770...

## Enhancement Cherry-pick feature https://github.com/pingcap/tidb/issues/57497 to release 8.5