client: cancel stale RM token streams on endpoint changes - #11227
client: cancel stale RM token streams on endpoint changes#11227rleungx wants to merge 2 commits into
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Interrupt an in-flight token request when resource-manager service discovery or the PD leader changes. This lets the dispatcher reconnect instead of remaining blocked on the old stream. Add a regression test that switches from a deliberately blocked PD token stream to a standalone resource-manager endpoint. close tikv#10154 Signed-off-by: Ryan Leung <rleungx@gmail.com>
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Repository UI Review profile: CHILL Plan: Advanced Run ID: 📒 Files selected for processing (3)
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Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughThe client now cancels stale token requests during resource manager endpoint changes, rechecks updates during reconnects, and preserves requests across reconnect attempts. Tests cover cancellation, repeated endpoint updates, and successful requests through the new endpoint. ChangesToken connection reconnection
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant Client
participant PD
participant RM
Client->>PD: Send token request
PD-->>Client: Signal request received
Client->>PD: Update resource manager endpoint
PD->>PD: Cancel stale token request
PD->>RM: Reconnect token stream
Client->>PD: Update endpoint during reconnect
PD->>RM: Preserve and send token request
RM-->>Client: Return token response
Merge Risk: ⚪ Minimal · up to The endpoint-switch recovery changes are covered by the updated dispatcher behavior and regression tests, with no remaining merge-blocking risk identified. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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Inline comments:
In `@client/resource_manager_client.go`:
- Line 381: Update the reconnect flow around tryResourceManagerConnect so that,
immediately after registering connection.cancel, it rechecks
updateTokenConnectionCh before calling processTokenRequests. If an endpoint
update is pending, reconnect again while preserving firstRequest, preventing it
from entering Recv on the obsolete stream; add a regression test covering an
endpoint update during tryResourceManagerConnect.
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client/inner_client.goclient/resource_manager_client.goclient/resource_manager_client_test.go
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Recheck endpoint updates after creating a token stream and preserve the current request when the stream is canceled before it is sent. Synchronize connection cancellation registration with update notification delivery, and add a regression test for endpoint changes during reconnect. Signed-off-by: Ryan Leung <rleungx@gmail.com>
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Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## master #11227 +/- ##
==========================================
- Coverage 79.79% 79.74% -0.05%
==========================================
Files 544 545 +1
Lines 78879 78913 +34
==========================================
- Hits 62942 62933 -9
- Misses 11570 11604 +34
- Partials 4367 4376 +9
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What problem does this PR solve?
TestSwitchModeDuringWorkload/pd-to-standalonecan time out even after resource-manager service discovery has switched to the standalone endpoint.The token dispatcher only checks reconnect notifications between requests. An in-flight
Recvon the old stream can therefore remain blocked, preventing the controller from observing a successful post-switch token response.Issue Number: Close #10154
What is changed and how does it work?
Check List
Tests
Release note
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