test(redis-rs): fix test-infra bugs masked by #[serial] and drop --test-threads=1 by nderraugh · Pull Request #7249 · valkey-io/valkey-glide

nderraugh · 2026-09-30T16:15:46Z

Summary

Every redis-rs integration test carries #[serial_test::serial], and glide-core-engine.yml additionally runs the suite with --test-threads=1 behind a "TODO remove after we fix test flakyness" that dates from #2488. This PR fixes the sources of the bugs that were masked by linearizing the tests, then removes the attributes and the flag.

Result with CI's invocation (cargo test --release, default threads, macOS, valkey 9.1.2): 126-134s for 706 tests, against ~1031s in CI (run 35792980918) and ~1270s locally with --test-threads=1 on the same commit. Roughly 8-10x. Nothing is skipped; the same 3 tests remain #[ignore]d.

Issue link

no linked issue yet: the tracking issue for the redis-rs test-infra work is being filed alongside this draft and will be linked here.

Features / Behaviour Changes

One product-side fix, exposed by (and required for) parallel runs: Connection::read_response only marked the sync connection closed on UnexpectedEof. A peer that dies with data in flight delivers RST, so the read fails with ConnectionReset while is_open() still reports true on a dead socket. The write path already treated both as dropped; the read path now does too. Everything else is test code and CI config.

Implementation

One commit per fix so each can be reviewed and reverted alone:

commit	what	why it was hidden
`9c8d06787`	`fix(redis-rs)`: treat `ConnectionReset` as closed in `read_response`	`test_redis_server_down` fails ~1 in 7-14 whole-binary parallel runs without it (0 in 10 isolated)
`8f60bde2c`	cluster test nodes start on random ports via the existing `get_random_available_port()` instead of 7000-7005	every concurrent cluster test fought over the same six ports
`5fb0ea742`	mock connection handlers get a unique name per test	`MockConnectionUtils` map is process-global; tests shared the literal keys `"node"` and `"foo"`, so one test's `RemoveHandler::drop` evicted another's entry
`9553b1c0c`	`block_on_all` panic detection uses a thread-local flag set by a once-installed, chained panic hook, instead of re-installing a process-global hook with a static flag on every call	a panic in one test poisoned unrelated tests' assertions (and each call replaced the previous test's hook)
`3d8e626db`	node startup retries pick fresh ports (`PortPolicy::Fresh`)	`get_random_available_port` drops its probe socket before the server binds; retrying the same port just fails again
`9face572d`	`scan_failover` restarts its cluster on the ports it was allocated (`PortPolicy::Fixed`)	the restart assumed 7000-7005
`7f79d7fa2`, `268a88d14`	OpenTelemetry tests use `#[serial(otel)]` writers vs `#[parallel(otel)]` readers, and write output to a per-process tempdir; a guard test fails if a new OTel test lands without the attribute	six tests read process-global counters and a fixed `/tmp` output path (same class as #4057)
`0907e7422`	`#[tokio::test]` items declare their class too: the ten AZ-affinity tests run `parallel(otel)`; the three throughput tests run `serial(otel)` because they assert on wall-clock rates and need a quiet machine; the guard matches `#[tokio::test]` and asserts a per-spelling floor (`#[test]` >= 100, `#[tokio::test]` >= 10)	the guard exact-matched `#[test]`, so the 13 `#[tokio::test]` functions ran with no `serial_test` attribute at all
`d1fa4a270`	`retries(0)` on `test_async_cluster_handle_missing_slots_in_split_multi_shard_command`	test spent 7-15 min in legitimate exponential backoff (0.01s now); CI ran it green, it was never a hang
`ac50a4b4c`	remove ~130 lines of `#[serial]` across six test files; drop `--test-threads=1` and the TODO from `glide-core-engine.yml`; rename the tee'd artifact `test-results.xml` -> `test-output.log` since it is stdout, not JUnit	the payoff step; only safe after the above
`0a0b4bf6c`, `d9ebf0067`, `5a8fb4f5c`	node readiness proves ownership (`INFO server` pid must match the spawned child) instead of a bare connect; `--cluster create` output is captured and a failure under `PortPolicy::Fresh` restarts the nodes on fresh ports; the standalone path tolerates a reset during connect and checks pid before `FLUSHDB`; cluster-start timeout 20 s under load	the readiness check accepted any socket answering on a just-released port, so a sibling test's listener could satisfy it and `--cluster create` then failed with empty captured output (seen 1 in 5 full-suite runs locally and once in CI)
`9ec81a0eb`	both startup paths share `support/readiness.rs`: 5 s overall deadline, 500 ms per attempt each in its own runtime; I/O, dropped-connection and LOADING errors retry, a missing or foreign pid fails at once, `FLUSHDB` only after ownership is established	review: standalone readiness stopped at the first TCP connect and mapped any `INFO` error to a `None` pid (13 of 700 runs); the cluster ownership probe had no read deadline, so a silent listener blocked the retry loop
`c8101db15`	`reserve_ports_for_restart` returns a process-local reservation token that `get_random_available_port` honours, acquired before the old cluster is dropped and released after the replacement starts; forced-collision tests for `Fresh` recovery and `Fixed` exhaustion	review: a parallel fixture could take a released client or bus port during restart downtime, and the fixed-address retries then failed every run; no test drove the collision branches
`87cef7be4`	unit test forcing a read-side `ConnectionReset` (peer closes with zero `SO_LINGER` after parsing PING) for RESP2 and RESP3; fails if the predicate reverts to `UnexpectedEof`-only	review: existing server-down tests could pass through EOF or a write-side error
`c63c321bf`	standalone `TestContext` constructors share a bounded startup loop that restarts on a fresh address only for a classified collision (child logged `Address already in use`, or a foreign pid answered); misconfiguration fails once	review: standalone startup spawned once and panicked on the same port race the cluster harness already retried

Reviewer attention: support/cluster.rs carries most of the logic (PortPolicy, per-attempt port reallocation, the readiness loop). The only serialization left in the crate is serial(otel)/parallel(otel).

Limitations

Port reservations coordinate the allocator within one test process only. A separate test binary or an unrelated process can still take a port between the probe and the bind; both startup paths now classify that as a collision and restart on a fresh address (bounded), and fixed-address restarts stay bounded.
test_async_cluster_scan_failover intermittently never returns (~1 in 4 runs, reproduces on untouched main). This is (core): cluster_scan is not bounded by requestTimeout and never settles when a primary is unreachable #6824: try_scan's retryable branch has no counter or deadline, topology refresh against an all-dead cluster reports no change, and next_scan_state hands back the same dead address, so retries(1) is never applied (trace and source chain in this comment). A 10 s guard on the outage scan is held back until the product fix lands, since on its own it would turn the hang into a red job.
Local only: the run-to-run noise on the CI job for this suite is ~15% (22m33s-26m04s over three FMT days), so the numbers above are the local profile, not a CI measurement.

Testing

Review-fix commits (9ec81a0eb..c63c321bf): readiness 7/0, cluster startup 5/0, standalone startup 5/0 (plus under REDISRS_SERVER_TYPE=unix), connection::tests 21/0, test_basic 57/0, sync test_cluster 36/0; cargo fmt --check and clippy-all.sh 11/11 clean. Mutation check for 87cef7be4 recorded in its thread.
5 x cargo test --release (CI's step minus the flag), release, default threads, back to back on one host: 706/0 in runs 1-4 at 128s, 130s, 126s, 134s; run 5 failed as described in Limitations.
Prerequisite check for 9c8d06787: reverted, test_basic whole-binary parallel failed 1 in 14 cargo test runs and 2 in 5 cargo nextest run runs; 0 in 10 isolated. Restored, 706/0.
Missing-slots test: 7-15 min before, 0.01s after; matches CI (which passes it, slowly).
OTel guard: verified to fail naming the function when a #[tokio::test] lacks its attribute, and to fail on the floor when #[tokio::test] matching is disabled (114 #[test] and 0 #[tokio::test]).
cargo test --doc still runs as its own CI step; untouched.

Checklist

This Pull Request is related to one issue.
Commit message has a detailed description of what changed and why.
Tests are added or updated.
CHANGELOG.md and documentation files are updated.
Linters have been run (make *-lint targets) and Prettier has been run (make prettier-fix).
Destination branch is correct - main or release
Create merge commit if merging release branch into main, squash otherwise.
Make sure to update the documentation in the valkey-glide-docs repository if necessary (not needed)

yoke-derive 0.8.3 (and 0.8.2) were yanked on crates.io. deny.toml sets yanked = "deny", so every Rust lint job fails with error[yanked] once the runner's crates.io index is fresh. Bump to 0.8.4 in all 12 lockfiles via `cargo update -p yoke-derive`; this also pulls in synstructure 0.14 / syn 3 which 0.8.4 depends on. Proc-macro only, no source changes. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com>

Connection::read_response only set `open = false` when the read failed with UnexpectedEof. A peer that dies with data in flight delivers an RST first, so the read fails with ConnectionReset instead and is_open() stays true on a dead socket. The write path already classifies BrokenPipe, ConnectionReset and UnexpectedEof as a dropped connection via RedisError::is_connection_dropped; use the same predicate on the read path. Surfaced by test_basic::test_redis_server_down failing ~1 in 3 full parallel runs under cargo-nextest (assertion failed: !con.is_open(), after "Connection reset by peer"). Signed-off-by: Neil Derraugh <neil.derraugh@improving.com> (cherry picked from commit 444af0ebfc5661352a37fbef6434466f96f4f6d2)

`RedisCluster::with_modules` started every node on 7000..7000+N, so two clusters alive at once fought for the same ports, and a node from a previous test still holding 7000 failed the next test's spawn retries with `redis server creation failed`. That is the flakiness behind the `--test-threads=1` TODO in redis-rs.yml. Nodes now take an ephemeral port from `get_random_available_port()` like the standalone server already does. The cluster bus port is chosen explicitly (`--cluster-port`) because the default `port + 10000` is rejected by the server for client ports above 55535. Two reconnect tests in test_cluster_async.rs drop the cluster, start a new one and expect the old connection to recover, which only worked because the new cluster reused 7000-7002. `RedisCluster` now records the ports it bound and `TestClusterContext::restart_on_ports` rebuilds on them, making the "same addresses" intent explicit. No `#[serial]` or CI changes yet; this only makes removing them possible. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com>

`MOCK_CONN_BEHAVIORS` is a process-global map keyed by a caller-supplied name, and `RemoveHandler::drop` evicts by that name, so two live tests registering `"node"` tore each other's handler down (`MockConnectionUtils for "node" were not installed`). The colliding sites now use the enclosing test function name, hard-coded `node:PORT` redirects follow the name, and `register_new` asserts the name is not already registered so this cannot silently recur. That assertion found `test_cluster_replica_read` / `test_async_cluster_replica_read` re-registering under one name while the first handler was still alive; the second environment now has its own name. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com>

`block_on_all` installed a panic hook on every call and read a process-wide `static CHECK: AtomicBool`, so under concurrent tests one test un-installed another's hook and a panic in any test's tasks was attributed to whichever test polled the flag first (the code's own TODO called it "purely single threaded"). The hook is now installed once via `Once`, chained to the previous hook so the default panic report is kept, and sets a thread-local flag. The runtime is current-thread, so a panic inside this test's tasks is seen by this test only. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com>

get_random_available_port releases its probe socket before the server binds, so a concurrently starting test can take the port in that window. The old retry loop re-spawned on the same --port/--cluster-port, so it could never recover from a lost race. Extract a single-attempt start_node() (process reaped on early exit and on the port-never-opened timeout) and, on failure, pick a fresh port pair (PortPolicy::Fresh) for new clusters. restart_on_ports keeps the same ports (PortPolicy::Fixed) and waits for them to free, since a client already knows those addresses. Full parallel suite (no --skip): 706 passed, 0 failed, ~2m24s vs 1199s serialized. clippy --all-targets clean. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com> (cherry picked from commit de4b5edc0697efc2b2004a8b67b463c7fdfa512c)

test_async_cluster_scan_failover drops the cluster mid-scan and builds a new one, relying on it coming back on 7000-7002 so the connection's known node addresses still resolve. With random ports the new cluster is elsewhere and the reconnect task retries dead addresses indefinitely (observed: 80 min spin, 13 GB of WARN logs). Record the ports before the drop and bring the cluster back on them with TestClusterContext::restart_on_ports, as the two reconnect tests in test_cluster_async.rs already do. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com> (cherry picked from commit a80d8b53a588ffcc3860a9588cfdf27a2c5fd303)

Replace the bare #[serial_test::serial] on the 7 OpenTelemetry tests with lets the non-OTel tests run concurrently while guaranteeing no test overlaps an OTel test, which is required because the OTel counters are process-global and any test can increment them via the MOVED path. Add every_test_declares_otel_scheduling_class, a source-walking guard that fails deterministically if any #[test] is missing the otel scheduling attribute, turning a future omission into a hard failure instead of a flake. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com> (cherry picked from commit f66b2decaab06c7f68ca5ac1ae27ebeb1820bdc1)

The OTel tests wrote spans/metrics to fixed /tmp/spans.json and /tmp/metrics.json. Under a per-test-process runner (cargo-nextest) the 7 tests run concurrently and clobber each other's files ("Metric not found", sibling's counter values); two cargo test invocations on one machine had the same problem. Scope the files to the process via a OnceLock<TempDir>, matching the exporter's own singleton lifetime. Under nextest each test now has its own files and needs no serialization at all (7/7 in 7.8s fully concurrent); under cargo test the binary's tests share them and remain serialized by #[serial_test::serial(otel)]. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com> (cherry picked from commit e6def17ab7e65a7df189a83041f272e8cb99314c)

test_async_cluster_handle_missing_slots_in_split_multi_shard_command asserts that an MGET whose keys hash to unowned slots fails with ConnectionNotFoundForRoute. That error is produced on the first attempt, but the default client retries 16 times with exponential backoff through a slot refresh the mock can never satisfy, so the test took 7-15 minutes (403s and 810s measured locally) before returning the error it already had. Build the mock client with retries(0), matching the idiom other MockEnv tests in this file already use, so the test completes in milliseconds. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com> (cherry picked from commit 7ea491e61751a70feca7b1ce335a0dde8e851869)

Every redis-rs integration test carried `#[serial_test::serial]` and glide-core-engine.yml also passed `--test-threads=1` with a TODO to remove it "after we fix test flakyness". The flakiness was the test infrastructure fixed in the preceding commits (fixed cluster ports, shared mock-handler names, a process-global panic hook, process-global OpenTelemetry counters), not the tests. With those fixed the suite passes with default threads, so the attributes and the flag go. The OpenTelemetry tests keep `#[serial(otel)]` against the `#[parallel(otel)]` readers introduced earlier; that is the only serialization left. The uploaded artifact is renamed from `test-results.xml` to `test-output.log`: it is tee'd stdout, not JUnit. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com>

nderraugh · 2026-09-30T17:18:44Z

CI timing: `glide-core-engine-CI` Test step, before and after

First CI measurement of this change, against the last two weeks of the same job on main and other PRs. Same workflow (glide-core-engine CI, formerly redis-rs CI), same Test step, same ubuntu-latest runner class; only the --test-threads=1 flag differs.

date	head / trigger	threads	Test step	whole job	run
2026-09-30	this PR, `ac50a4b4c`	default	5m48s	19m52s	job
2026-09-30	#7244 `fix/close-detaches-blocked-connection`	1	21m28s	35m	job
2026-09-30	same PR, earlier head	1	22m59s	36m	job
2026-09-29	same PR	1	27m13s	40m	job
2026-09-29	`stevenzengg/redirect-address-resolver-fixes`	1	20m19s	36m	job
2026-09-26	`main` push	1	18m45s	34m	job
2026-09-26	`6905-glide-prefix-engine`	1	25m41s	41m	job
2026-09-16	`perf/mget-core-pipeline` (`redis-rs-CI`)	1	28m00s	40m	job
2026-09-15	`feat/no-dirty-trees` (`redis-rs-CI`)	1	27m12s	43m	job
2026-09-14..17	nightly `FMT - Redis-RS` (3 runs)	1	18m33s - 20m22s	31m - 36m	job

Serialized Test step over the period: 18m33s to 28m00s, median about 21m30s. Parallel: 5m48s, so 3.2x against the fastest serialized run and about 3.7x against the median. That is less than the 8-10x measured locally (126-134s vs ~1270s on an M-series laptop), which is the expected shape: the suite is bound by how many cluster boots the runner can overlap, and ubuntu-latest has fewer cores.

Two caveats so nobody over-reads a single run:

Run-to-run spread on the serialized step is ~9 minutes (about 40%), so one more parallel run would be needed before quoting a firm ratio; the point that stands regardless is that the fastest serialized step ever recorded here is still 3x the parallel one.
With the Test step at ~6 min, Run benchmarks (7m05s) is now the longest step in the job.

coderabbitai · 2026-10-01T19:28:29Z

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📥 Commits

Reviewing files that changed from the base of the PR and between a711bec and 034ec5a.

📒 Files selected for processing (11)

.github/workflows/glide-core-engine.yml
glide-core/redis-rs/redis/src/connection.rs
glide-core/redis-rs/redis/tests/support/cluster.rs
glide-core/redis-rs/redis/tests/support/mod.rs
glide-core/redis-rs/redis/tests/support/ports.rs
glide-core/redis-rs/redis/tests/support/readiness.rs
glide-core/redis-rs/redis/tests/test_cluster_async.rs
glide-core/redis-rs/redis/tests/test_cluster_scan.rs
glide-core/redis-rs/redis/tests/test_support_cluster_startup.rs
glide-core/redis-rs/redis/tests/test_support_readiness.rs
glide-core/redis-rs/redis/tests/test_support_standalone_startup.rs

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.

📝 Walkthrough

Walkthrough

The pull request updates Redis test startup, port allocation, and parallel scheduling. It adds cluster restart support, changes CI test output handling, and expands connection shutdown handling to errors classified as dropped connections.

Changes

Redis test parallelization and startup

Layer / File(s)	Summary
Port reservation and server readiness `glide-core/redis-rs/redis/tests/support/ports.rs`, `glide-core/redis-rs/redis/tests/support/readiness.rs`, `glide-core/redis-rs/redis/tests/support/mod.rs`, `glide-core/redis-rs/redis/tests/test_support_standalone_startup.rs`, `glide-core/redis-rs/redis/tests/test_support_readiness.rs`	Test support reserves ports, checks Redis process ownership, and retries standalone startup after port collisions. Tests cover readiness errors, retries, and timeouts.
Cluster startup and restart `glide-core/redis-rs/redis/tests/support/cluster.rs`, `glide-core/redis-rs/redis/tests/test_support_cluster_startup.rs`, `glide-core/redis-rs/redis/tests/test_cluster_async.rs`, `glide-core/redis-rs/redis/tests/test_cluster_scan.rs`	Cluster fixtures record client and bus ports, retry startup with fresh or fixed ports, and restart on reserved ports. Tests exercise collision handling and restart behavior.
Parallel scheduling and mock isolation `glide-core/redis-rs/redis/tests/auth.rs`, `glide-core/redis-rs/redis/tests/test_basic.rs`, `glide-core/redis-rs/redis/tests/test_cluster.rs`, `glide-core/redis-rs/redis/tests/test_cluster_pipeline.rs`, `glide-core/redis-rs/redis/tests/test_cluster_scan.rs`, `glide-core/redis-rs/redis/tests/test_cluster_async.rs`, `glide-core/redis-rs/redis/tests/support/mock_cluster.rs`	Many tests no longer have `serial_test::serial`. Async tests use OpenTelemetry scheduling classes, and cluster mocks use test-specific names. Telemetry output uses process-scoped temporary paths, and a test checks scheduling attributes. The async suite adds mTLS certificate-rotation coverage.

CI test output

Layer / File(s)	Summary
Test command and artifact output `.github/workflows/glide-core-engine.yml`	The test command uses Cargo’s default thread selection and writes `test-output.log`. The upload step publishes that log.

Connection shutdown handling

Layer / File(s)	Summary
Shutdown for dropped-connection errors `glide-core/redis-rs/redis/src/connection.rs`	`read_response` follows the existing shutdown and notification path for errors classified as dropped connections. A test covers connection resets with RESP2 and RESP3.

Suggested reviewers: meitalkra, liorsve

Priority: ➖ Normal

Change: Other

Merge Risk: ⚪ Minimal · up to 034ec

This change runs the Redis integration tests in parallel. Standalone test servers now retry on a new port when a port collision occurs instead of failing immediately. The production change is limited to closing connections on reset errors. No merge-blocking issue remains, although occasional test flakiness from port reuse may still need follow-up.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 034ec

The production change closes dead connections more consistently. The reviewed fixture changes remain test-only, preserve local network bindings and clean up owned processes on failure. No introduced security concern was established. Residual cross-process port contention and incomplete downstream coverage limit assurance.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

inferred — The inspected production effect is scoped to the affected synchronous connection and its existing notification channel. Fixture concurrency affects test-runner processes and local ports; the resolved fixture callers do not introduce a production service entrypoint.

Trust Boundaries and Controls

observed — Cleanup targets the fixture's stored Child rather than the process answering its port. TLS and mutual-TLS fixture construction remain paired with their existing client certificate configuration. PID matching is a local ownership check, not authentication against a malicious server capable of falsifying INFO.

Resilience and Maintainability Implications

observed — Port reservations coordinate only within a process; unrelated processes can still win the probe-to-bind race. Startup handles collisions through retries or fixed-port failure. On production read failure, notification-channel closure does not prevent marking the socket closed, shutdown errors are ignored, and inspected request callers propagate failure without adding command replay.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 75.09% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 273 functions across 12 files. (1 skipped…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main changes: fixing Redis test-infrastructure issues, removing blanket serialization, and enabling default test-thread parallelism.
Description check	✅ Passed	The description is detailed and covers the template’s summary, behavior changes, implementation, limitations, testing, and checklist. The issue link is still pending, and some checklist items remain u…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 75.09% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 273 functions across 12 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

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jamesx-improving

Two inline notes, both on the same #[tokio::test] blind spot: the three perf tests this PR de-serialized end up with no scheduling class at all, and the new guard can't see #[tokio::test], so it won't catch them or the next one.

… see them The OTel scheduling guard exact-matched `#[test]`, so the 13 `#[tokio::test]` functions in test_cluster_async.rs were never checked and ran with no serial_test attribute at all. The ten AZ-affinity tests now run `parallel(otel)`; the three throughput tests run `serial(otel)`, since they assert on wall-clock rates and the blanket `#[serial]` they lost was what kept the machine quiet for them. The guard now matches `#[tokio::test]` and `#[tokio::test(...)]`, resolves `async fn` names, and asserts a per-spelling floor instead of `checked > 0`, so exempting one attribute spelling trips it regardless of how the other count grows. Addresses review feedback on #7249. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com>

…ailure Two runs of the parallel suite (one local, one in CI) failed in `valkey-cli --cluster create` after every node had passed the readiness check: all five retries exited 1 within 250ms. The readiness check is a bare TCP connect, so a socket that another concurrently starting test left on a just-released ephemeral port satisfies it even though our node never bound, and the create loop then retries the same dead address. - After a node answers, query `INFO server` and require `process_id` to equal the spawned child's pid; a mismatch or an early exit is a start failure, which the existing per-node retry handles (fresh ports under `PortPolicy::Fresh`). - A `--cluster create` failure under `PortPolicy::Fresh` tears the nodes down and starts a new set on fresh ports instead of retrying the same addresses. - Capture the cluster-create output. redis-cli prints cluster-manager errors on stdout, which was discarded, so the CI failure carried no diagnostic. The TLS cert tempdir is kept separate from the node tempdirs so a node restart does not delete the certificates the new nodes are started with. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com>

…o a standalone test server In 1 of 10 parallel full-suite runs `TestContext::connect_with_retries` panicked with `Connection reset by peer` while connecting to a server it had just spawned. The helper retried only on connection refusal, but a reset is equally expected while the port settles: a sibling test's `get_random_available_port` probe listener (backlog 1, SO_REUSEADDR) can briefly hold the port, accept the connect, and drop it. - Retry on `is_connection_dropped()` as well as refusal, and fail fast if the spawned server has already exited. - Once connected, require `INFO server`'s `process_id` to be the spawned child's pid before running `FLUSHDB`, so a connection that landed on another test's server is reported instead of wiping its data. - Share the `INFO server` parser with the cluster harness. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com>

Signed-off-by: Neil Derraugh <neil.derraugh@improving.com>

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Inline comments:
Review comments at @glide-core/redis-rs/redis/tests/support/mod.rs:
- Around line 424-429: Update connect_with_retries to return a Result instead of
panicking when the server exits before accepting connections or the port belongs
to a different PID; have TestContext startup paths in with_modules, with_tls,
and with_client_name retry by restarting RedisServer on a fresh port a bounded
number of times, then fail if all attempts are exhausted.

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glide-core/redis-rs/redis/tests/support/cluster.rs
glide-core/redis-rs/redis/tests/support/mod.rs

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Aryex

My reviewer flagged the following issues.

Signed-off-by: Neil Derraugh <nderraugh@gmail.com>

Require the competing fixture to be ready before restart and remain alive through the replacement-cluster check. Signed-off-by: Neil Derraugh <nderraugh@gmail.com>

Signed-off-by: Neil Derraugh <nderraugh@gmail.com>

…ter a port collision `get_random_available_port` releases its probe socket before the child binds, so another process can take the port in between. The cluster harness already retries on fresh ports; the standalone `TestContext` constructors spawned once and panicked. They now share one bounded startup loop that re-spawns on a fresh address only when the failure is a collision (the child logged "Address already in use", or a live foreign process answered the ownership probe), and fail immediately on anything else so a misconfigured server is not retried elsewhere. `readiness::wait_for_server` returns a typed `ReadinessError` so that classification does not depend on matching message text; Display keeps the previous wording. Tests force each case deterministically: a held port retries on a fresh one, a foreign owner retries, a bad config directive is not retried, a persistent collision stops after the attempt limit, and the log string the classifier reads is pinned against what the server actually writes. Addresses the CodeRabbit standalone-restart comment on #7249. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com>

Both reservation tests ended by binding the just-released ephemeral port again. Sibling tests in the same binary boot real clusters whose outgoing connections can take that port in the meantime, so the bind raced the kernel's ephemeral allocation and failed in CI (overlapping_reservations_survive_drop_and_unwind, run 37382492429). The tests claim the reservation map released the port, so assert that directly. Signed-off-by: Neil Derraugh <neil.derraugh@improving.com>

nderraugh · 2026-10-06T23:07:19Z

Post-merge follow-up: CI timing

Watched every glide-core-engine CI job created in the four hours after this merged (79cd9a178, 2026-10-06 16:15Z), on any branch, to compare against the serialized suite.

branch / event	sha	Test step	whole job	result
main push (this merge)	`79cd9a178`	363 s	1097 s	pass
dependabot PR	`3a48b48d7`	413 s	1246 s	pass
PR `fm/fix-3929-go-backoff-uint32-n8`	`98bdcde70`	405 s	1178 s	pass
PR #7298	`ff96fd629`	414 s	1232 s	pass
PR #7298	`946706c21`	401 s	828 s	pass

Pre-merge baseline for the same step on main (last four runs): 1028 s, 1083 s, 1125 s, 1842 s, median about 1100 s. Post-merge the five completed runs sit at 363-414 s, median 405 s: roughly 2.7x faster than the baseline median, 2.5x vs the fastest baseline, 4.5x vs the slowest. Run-to-run spread shrank from ~800 s to ~50 s. Run benchmarks (445-464 s) is now the longest step in the job.

Still open from Limitations

scan_failover hang: (core): cluster_scan is not bounded by requestTimeout and never settles when a primary is unreachable #6824, with the redis-rs-level trace posted there. The handoff's 10 s timeout guard waits on that fix.
Port reservations are per-process; two test binaries in one job are still isolated only by the kernel's ephemeral-port allocator.

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nderraugh force-pushed the redis-rs-test-infra-v3 branch from 0e7f3bd to d0dec56 Compare September 30, 2026 16:18

nderraugh added 10 commits September 30, 2026 12:24

nderraugh force-pushed the redis-rs-test-infra-v3 branch from d0dec56 to ac50a4b Compare September 30, 2026 16:26

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[Rust][Flaky Test] test_all_subscription_types_survive_failover #5922

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Merge branch 'main' into redis-rs-test-infra-v3

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Merge branch 'main' into redis-rs-test-infra-v3

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Merge branch 'main' into redis-rs-test-infra-v3

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nderraugh marked this pull request as ready for review October 1, 2026 19:18

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jamesx-improving approved these changes Oct 1, 2026

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Comment thread glide-core/redis-rs/redis/tests/test_cluster_async.rs Resolved

Comment thread glide-core/redis-rs/redis/tests/test_cluster_async.rs Resolved

Aryex self-requested a review October 2, 2026 17:26

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nderraugh added 3 commits October 2, 2026 16:23

fix(test): double timeout to 20s for cluster starts under high load

5a8fb4f

Signed-off-by: Neil Derraugh <neil.derraugh@improving.com>

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Merge branch 'main' into redis-rs-test-infra-v3

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Comment thread glide-core/redis-rs/redis/tests/support/mod.rs Resolved

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Merge branch 'main' into redis-rs-test-infra-v3

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nderraugh mentioned this pull request Oct 5, 2026

Add regression coverage for read-side ConnectionReset handling #7283

Closed

nderraugh and others added 4 commits October 5, 2026 17:22

fix(redis-rs): bound test server readiness and ownership probes

9ec81a0

Signed-off-by: Neil Derraugh <nderraugh@gmail.com>

fix(redis-rs): reserve test ports across cluster restarts

c8101db

Require the competing fixture to be ready before restart and remain alive through the replacement-cluster check. Signed-off-by: Neil Derraugh <nderraugh@gmail.com>

test(redis-rs): cover read-side connection reset shutdown

87cef7b

Signed-off-by: Neil Derraugh <nderraugh@gmail.com>

nderraugh mentioned this pull request Oct 5, 2026

(core): cluster_scan is not bounded by requestTimeout and never settles when a primary is unreachable #6824

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Merge branch 'main' into redis-rs-test-infra-v3

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Merge branch 'main' into redis-rs-test-infra-v3

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nderraugh merged commit 79cd9a1 into main Oct 6, 2026

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test(redis-rs): run the redis-rs test suite under cargo-nextest #7300

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test(redis-rs): fix test-infra bugs masked by #[serial] and drop --test-threads=1 - #7249

test(redis-rs): fix test-infra bugs masked by #[serial] and drop --test-threads=1#7249
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CI timing: glide-core-engine-CI Test step, before and after

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Post-merge follow-up: CI timing

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CI timing: `glide-core-engine-CI` Test step, before and after

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