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Rongsong Shen 81cb09a8db fix(controller): drop RDHUP while electing — break dueling-candidate term escalation (task 5.6)
After 5.5 let the freshest survivor win PreVote and ENTER the real election,
round 4 still stalled: the dead primary's control fd keeps RDHUP'ing on a
deterministic ~15s cadence, and ha_on_primary_ctrl_fd_rdhup's 5.2 suppress only
catches CTRL_STANDBY — so an ELECTING node fell through to ha_begin_failover and
restarted a fresh PreVote, preempting its own in-progress real election. Every
cycle bumped the term (21->25->28->29...) and kept two survivors dueling in
lockstep, defeating the jittered election-timeout tiebreak.

Guard the RDHUP entry: if role==CTRL_ELECTING or a PreVote round is in progress,
close the dead control fd and return WITHOUT restarting failover — let the
in-progress round finish or time out (its election timeout is jittered, which
desynchronizes the duel so one survivor wins). A node not currently electing
still takes the normal 5.2-suppress / genuine-loss failover path.

RED+PIN in test_ha_core_safety.c (22 Tests / 0 Failures): CORE RED — CTRL_ELECTING
+ RDHUP must not start a new PreVote (Expected 0 Was 1 on baseline); PIN — genuine
loss (STANDBY, not electing) still fails over. Preserves Election Safety, 5.2
suppression, and genuine-loss liveness. Re-running 7.2.

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019dbTHR9CsEYK9RsqmQpQpC
2026-06-30 11:47:09 +00:00
.claude feat(xce-build): add non-ASAN debug + release profiles; root-cause bug-1286 with the debug build 2026-06-30 09:15:36 +00:00
.kiro docs(raft-ha-core-safety): 5.5 advertised-term fix verified as progress; add task 5.6 (dueling-candidate split-vote) 2026-06-30 11:38:21 +00:00
.wolf feat(xce-build): add non-ASAN debug + release profiles; root-cause bug-1286 with the debug build 2026-06-30 09:15:36 +00:00
docs/superpowers/plans claude skills 2026-05-29 15:00:06 +08:00
ha/data chore: checkpoint all prior work for clean state 2026-06-04 13:04:16 +00:00
raft chore: checkpoint all prior work for clean state 2026-06-04 13:04:16 +00:00
src fix(controller): drop RDHUP while electing — break dueling-candidate term escalation (task 5.6) 2026-06-30 11:47:09 +00:00
.clang-format reformat code and job array 2025-11-07 16:14:27 +08:00
.gitignore checkpoint: bug-851 root cause + raft TLA+ conformance spec family 2026-06-21 14:02:15 +00:00
.mcp.json checkpoint: bug-851 root cause + raft TLA+ conformance spec family 2026-06-21 14:02:15 +00:00
.opencode.json checkpoint: bug-851 root cause + raft TLA+ conformance spec family 2026-06-21 14:02:15 +00:00
CLAUDE.md chore: baseline snapshot — prior-session work + ha-consistency-invariants spec family 2026-06-11 13:21:50 +00:00
package-lock.json checkpoint: bug-851 root cause + raft TLA+ conformance spec family 2026-06-21 14:02:15 +00:00
package.json checkpoint: bug-851 root cause + raft TLA+ conformance spec family 2026-06-21 14:02:15 +00:00
README.md save works 2026-03-03 16:49:26 +08:00
uninstall-code-review-graph.sh checkpoint: bug-851 root cause + raft TLA+ conformance spec family 2026-06-21 14:02:15 +00:00

1. commit 规则

  • 每个人 fork 自己的 branch, 从自己的 branch 做 PR,review 完再 commit

2. code format

2.1. C

推荐使用 clang-format,公共配置放在源码里面 xce/.clang-format

(理论上直接使用源码里面 xce/.clang-format 文件格式不会变)

2.1.1. vscode 可以在配置中加上如下内容

"C_Cpp.clang_format_style": "WebKit",
"C_Cpp.clang_format_fallbackStyle": "WebKit",

2.1.2. vim & emacs

clang-format -style="{BasedOnStyle: webkit}" -i XX.c

2.2. golang

使用默认 gofmt

3. build environment and build (example of ubuntu)

3.1 build environment

  • Install nix package management tool
sh <(curl -L https://nixos.org/nix/install) --daemon
  • Edit /etc/nix/nix.conf to make sure
experimental-features = nix-command flakes
sandbox = true
sandbox-fallback = false
substituters = https://mirrors.ustc.edu.cn/nix-channels/store https://cache.nixos.org https://cache.nixos.org/
trusted-users = root <your account>

make sure that you have restarted nix-daemon service after you have changed /etc/nix/nix.conf

  • Install socat and config ssh (for clone by ssh protocol)
nix profile add nixpkgs#socat

.ssh/config

Host gitea.shenrs.eu
	HostName gitea.shenrs.eu
	IdentityFile ~/.ssh/id_ed25519
	ProxyCommand socat - openssl-connect:gitea.shenrs.eu:2022,snihost=gitea.shenrs.eu,verify=0

3.2 checkout source code

3.3 build (for package and release)

cd xce/src

# for build debug version
nix build --option sandbox false .#xcecore_debug

# for normal build
nix build --option sandbox false .#xcecore

You can find the generated binaries at =result= directory

3.4 build (for daily develop)

cd xce/src
nix develop

# using meson to generated build configuration (debug and address sanitize)

meson setup build --buildtype=debug -Db_sanitize=address

# run meson to build
meson compile -C  build

# The generated files will be in build/

3.5 build AppImage package

cd xce/src
nix bundle --bundler github:ralismark/nix-appimage --option sandbox false .#xce

This will create all in one AppImage file which contains everything for package delivery.

4. misc

4.1. Windows remap ctrl and alt key

create a reg file, e.g. remapkey.reg

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout]
"Scancode Map"=hex:00,00,00,00,00,00,00,00,05,00,00,00,38,00,1d,00,1d,00,38,00,38,e0,1d,e0,1d,e0,38,e0,00,00,00,00

then double click remapkey.reg to import it. Restart OS.