vip: switch VIP when the owner rejects connections - #1213
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📝 WalkthroughWalkthroughThe VIP manager now monitors connection rejection through the health manager. It resigns the VIP during rejection and recompetes after recovery. Startup, shutdown, election creation, and watcher behavior are covered by tests. ChangesVIP rejection failover
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant Server
participant HealthManager
participant VIPManager
participant Election
Server->>VIPManager: SetConnRejecter(HealthManager)
VIPManager->>HealthManager: RejectConns()
HealthManager-->>VIPManager: rejecting
VIPManager->>Election: Close election
Election-->>VIPManager: VIP released
VIPManager->>HealthManager: RejectConns()
HealthManager-->>VIPManager: accepting
VIPManager->>Election: Create and start election
Election-->>VIPManager: VIP rebound
Merge Risk: 🟡 Moderate · up to A memory-constrained instance can acquire the VIP at startup and reject client connections before health monitoring releases it. The initial rejection state should be handled before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In `@pkg/manager/vip/manager_test.go`:
- Around line 333-334: Update the test’s watchRejecter setup to use vm.startCtx
instead of an independently created cancellable context, and remove the manual
watchCancel call. Keep shutdown driven through PreClose so it validates
cancellation of vm.startCtx and waiting for watchWG.
In `@pkg/manager/vip/manager.go`:
- Line 138: Update Start and the watchRejecter initialization around vm.election
= vm.newElection() to synchronously read ConnRejecter.RejectConns before
creating or starting the election, and initialize the watcher’s wasRejecting
state from that result so a rejecting server cannot acquire the VIP during the
first servingCheckInterval. Add a test covering startup with rejection enabled
and verify no election begins until recovery.
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📒 Files selected for processing (5)
pkg/manager/health/health.gopkg/manager/vip/manager.gopkg/manager/vip/manager_test.gopkg/manager/vip/mock_test.gopkg/server/server.go
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: YangKeao The full list of commands accepted by this bot can be found here. The pull request process is described here DetailsNeeds approval from an approver in each of these files:
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3 participants
What problem does this PR solve?
Issue Number: close #1200
Problem Summary:
When the VIP owner rejects connections because of high memory usage, the client can't connect to the database.
What is changed and how it works:
The vipManager reads from the healthManager periodically. When the instance rejects connections, resign the owner. When the instance accepts connections again, recompete the owner.
Check List
Tests
Mock the TiProxy code to test VIP. Logs:
Notable changes
Release note
Please refer to Release Notes Language Style Guide to write a quality release note.
Summary by CodeRabbit
New Features
Bug Fixes
Documentation