pingcap/tidb

after restarting, DDL will be blocked for a while

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#65543 opened on Jan 13, 2026

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component/ddlgood first issueseverity/minortype/bug

Description

Enhancement

$ tiup playground \
    -T test-restart \
    --tiflash 0 \
    --without-monitor

ctrl-C, then restart again

The second restart is at

[2026/01/13 13:12:49.192 +08:00] [INFO] [printer.go:52] ["Welcome to TiDB."] ["Release Version"=v8.5.4] [Edition=Community] ["Git Commit Hash"=e4e814fdc0afe9c3a6e5e96f129d83df802ab820] ["Git Branch"=HEAD] ["UTC Build Time"="2025-11-26 15:59:14"] [GoVersion=go1.23.6] ["Race Enabled"=false] ["Check Table Before Drop"=false]

but DDL owner elected at

[2026/01/13 13:13:55.716 +08:00] [INFO] [manager.go:503] ["get owner"] ["owner info"="[ddl] /tidb/ddl/fg/owner ownerManager d95d1b5a-ab19-479f-bde7-88840274fc15"] ["owner key"=/tidb/ddl/fg/owner/22319bb5c55cdb48] [ownerID=d95d1b5a-ab19-479f-bde7-88840274fc15] [op=none]

Contributor guide

Tech stack
go
Domain
backenddatabaseperformance
Issue type
performance
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
over 1 week
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
blocked
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
Go programmingDistributed systemsTiDB architecture
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
25
Research direction
The issue involves a delay in DDL owner election after restarting TiDB. The logs indicate that the DDL owner is elected about a minute later, causing DDL operations to be blocked. Investigate the DDL owner election logic in the manager.go file, specifically the election timings and heartbeats. Look for recent changes or known issues with the election mechanism. Check if there are any configuration options that could reduce the election delay.