pingcap/tidb

after restarting, DDL will be blocked for a while

Open

#65,543 建立於 2026年1月13日

在 GitHub 查看
 (8 留言) (0 反應) (1 負責人)Go (40,090 star) (6,186 fork)batch import
component/ddlgood first issueseverity/minortype/bug

描述

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]

貢獻者指南

技術棧
go
領域
backenddatabaseperformance
議題類型
performance
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
4
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
over 1 week
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
blocked
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Go programmingDistributed systemsTiDB architecture
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
25
研究方向
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.