pingcap/tidb

Verify that the DDL leases of all TiDBs in the cluster are consistent

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#14,760 opened on Feb 13, 2020

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help wantedsig/sql-infratype/enhancement

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Description

Feature Request

Is your feature request related to a problem? Please describe:

If TiDB in a cluster has different DDL leases, the schemas between TiDB may be out of sync.

Describe the feature you'd like:

It is best to verify that the DDL leases of all TiDBs in the cluster are consistent.

Describe alternatives you've considered:

Teachability, Documentation, Adoption, Migration Strategy:

Contributor guide

Research direction
Look into how DDL leases are set and stored in TiDB, and design a way to verify consistency across nodes during cluster health check.
Tech stack
go
Domain
database
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
Go
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40