chore: add test scenarios and docs for redis read replicas - #3177
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WalkthroughThe change adds optional Redis cluster replicas, updates cluster creation for dynamic replica discovery, documents replica read routing, and adds integration coverage for replica and master read behavior. ChangesRedis replica reads
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The PR adds Redis read-replica test infrastructure and documentation, but the Compose dependency/profile configuration can reject the base development setup, while the documentation example has a parameter mismatch and the probe ignores cancellation. Merge should wait for the Compose issue to be fixed, with the remaining issues addressed or explicitly accepted. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
Comment |
Router image scan passed✅ No security vulnerabilities found in image: |
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #3177 +/- ##
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Lines 31493 31493
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+ Hits 19750 19753 +3
+ Misses 10192 10190 -2
+ Partials 1551 1550 -1 🚀 New features to boost your workflow:
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Actionable comments posted: 3
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Inline comments:
In `@docker-compose.yml`:
- Around line 410-421: Update the redis-cluster-configure dependency definition
so the base Compose model references only redis-cluster-node-1 through
redis-cluster-node-3. Move redis-cluster-node-4, redis-cluster-node-5, and
redis-cluster-node-6 dependencies into a redis-cluster-replicas-specific Compose
override, preserving their service_healthy conditions.
In `@docs-website/router/configuration.mdx`:
- Around line 1370-1372: Update the startup error example in the Note to use
route_by_latency as the unsupported parameter, replacing read_only while
preserving the cluster_enabled: true context and redis.ParseURL error format.
In `@router/internal/rediscloser/read_replica_test.go`:
- Line 170: Update testRedisClusterURLs to accept and propagate ctx, and replace
net.DialTimeout with a net.Dialer using DialContext while retaining the existing
500-millisecond timeout.
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Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (5)
docker-compose.ymldocker/redis/redis-cluster-create.shdocs-website/router/configuration.mdxrouter/internal/rediscloser/read_replica_test.gorouter/internal/rediscloser/url_options_test.go
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| masterGets, len(nodes.masters), replicaGets, len(nodes.replicas)) | ||
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| require.Equal(t, int64(len(keys)*repeats), masterGets, "every read should have been served by a master") | ||
| require.Zero(t, replicaGets, "no read should have reached a replica by default") |
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question: wouldn't assert do the trick here too? It seems the whole PR uses require everywhere. Is that a rule that we're following in this repo?
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I don't think we have a strict rule here. I'm just very used to use require because it's my personal preference. If an assertion fails in most cases I don't want to continue with the test.
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| conn, err := net.DialTimeout("tcp", parsed.Host, 500*time.Millisecond) | ||
| if err != nil { | ||
| tb.Skipf("no redis cluster reachable at %s, skipping: %v", parsed.Host, err) |
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nit: I'm not super fond of this mechanism because it introduces a 500ms delay when cluster is not available. Maybe we could skip the tests when clusterURLsEnv is empty instead?
3 participants
This PR adds testing scenarios and docs for redis read replicas. The functionality is already provided by the client driver, the changes only showcase that this is working. We also update the docs with an example of how to configure the client using url query parameters.
Summary by CodeRabbit
New Features
Documentation
Tests
Checklist
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