fix: implement ThinEngine.CheckRuntimeReady to check actual runtime state#6062
fix: implement ThinEngine.CheckRuntimeReady to check actual runtime state#6062adityaupasani2 wants to merge 4 commits into
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…tate CheckRuntimeReady() was an unimplemented stub that unconditionally returned true, causing data operations to be dispatched against a ThinRuntime even when workers and FUSE pods were not actually ready. Implement it using the existing CheckWorkersReady() and checkFuseHealthy() helpers that are already used by CheckRuntimeHealthy(), so all three readiness signals are consistent. Also adds tests covering: workers+fuse both ready (returns true), workers not ready (returns false), fuse not ready (returns false), and fuse DaemonSet missing (returns false). Fixes fluid-cloudnative#6060 Signed-off-by: Aditya Upasani <adityaupasani29@gmail.com>
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Hi @adityaupasani2. Thanks for your PR. I'm waiting for a fluid-cloudnative member to verify that this patch is reasonable to test. If it is, they should reply with Once the patch is verified, the new status will be reflected by the I understand the commands that are listed here. DetailsInstructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. |
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Code Review
This pull request implements the CheckRuntimeReady method in pkg/ddc/thin/runtime_info.go to verify both worker readiness and fuse health. Additionally, it introduces comprehensive unit tests in pkg/ddc/thin/health_check_test.go to validate various success and failure scenarios for runtime readiness. There are no review comments, so I have no feedback to provide.
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| fuseReady, err := t.checkFuseHealthy() |
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checkFuseHealthy() delegates to ctrl.Helper.CheckAndSyncFuseStatus which unconditionally sets ready = true (see pkg/ctrl/fuse.go:61, comment: "fluid assumes fuse components are always ready"). This means CheckRuntimeReady() will never detect an unhealthy fuse, and the CI unittest "when fuse is not ready" fails for exactly this reason.
You either need (a) a dedicated fuse readiness check that inspects the DaemonSet's NumberUnavailable/NumberReady fields directly, or (b) to remove the fuse readiness assertion from CheckRuntimeReady (and the corresponding test) if the project intentionally treats fuse as always-ready.
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| func (t *ThinEngine) CheckRuntimeReady() (ready bool) { | ||
| //TODO implement me | ||
| workerReady, err := t.CheckWorkersReady() |
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Alluxio and Jindo implement CheckRuntimeReady() by probing the master pod's responsiveness (fileUtils.Ready()). ThinRuntime has no master pod so the approach is necessarily different, but a brief comment explaining why worker+fuse status is used instead would help future readers.
| //TODO implement me | ||
| workerReady, err := t.CheckWorkersReady() | ||
| if err != nil || !workerReady { | ||
| return false |
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Consider adding a t.Log.Info("runtime not ready", ...) statement before returning false, matching the pattern used in AlluxioEngine and JindoEngine. This will help operators debug readiness issues.
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| // TODO(cache runtime): figure out how to use this selector | ||
| // runtimeToUpdate.Status.Selector = e.getWorkerSelectors() | ||
| runtimeToUpdate.Status.Selector = e.getWorkerSelectors() |
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@cheyang currently, the field for all runtime is not used, can we just delete this field ?
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I left comments on the blocking issues below. |
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| fuseReady, err := t.checkFuseHealthy() |
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Thanks for wiring CheckRuntimeReady to the existing helpers — calling CheckWorkersReady() and checkFuseHealthy() is the right structure and matches what CheckRuntimeHealthy already does.
The problem is that checkFuseHealthy() delegates to Helper.CheckAndSyncFuseStatus in pkg/ctrl/fuse.go, and that function still unconditionally does ready = true (there is an explicit // fluid assumes fuse components are always ready line). So even when the fuse DaemonSet reports NumberReady: 0 / NumberUnavailable: 1, CheckRuntimeReady will return true.
The CI unittest run reflects this — the new CheckRuntimeReady > when fuse is not ready > returns false case at pkg/ddc/thin/health_check_test.go:770 still fails on this PR head (Project Check / unittest is red on 7c394fe). To unblock, please either:
- Update the readiness check so it inspects the DaemonSet status directly (e.g.
NumberUnavailable == 0andNumberReady > 0, similar to how AlluxioEngine / JindoEngine derive fuse readiness), or - Introduce a separate
checkFuseReady()helper used only byCheckRuntimeReadythat does this strict check, leaving the existing "assumes ready" status-sync behavior ofCheckAndSyncFuseStatusuntouched.
Option 2 is probably safer because it avoids changing the semantics that other code paths depend on. Once that is in place the when fuse is not ready Ginkgo case should pass and the unittest job should go green.
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| // TODO(cache runtime): figure out how to use this selector | ||
| // runtimeToUpdate.Status.Selector = e.getWorkerSelectors() | ||
| runtimeToUpdate.Status.Selector = e.getWorkerSelectors() |
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Commit 7c394fee ("populate Status.Selector in CacheEngine for worker pod discovery", Fixes #6063) is a different concern from the ThinEngine readiness fix described in the PR title and #6060. The change itself looks reasonable and consistent with how other runtimes set Status.Selector, but mixing it into this PR makes the readiness fix harder to review and ties the merge of #6060 to an unrelated #6063 fix.
Could you move the CacheEngine selector change to its own PR against #6063? That keeps this PR focused on the ThinEngine CheckRuntimeReady fix and lets the two land independently.
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| fuseReady, err := t.checkFuseHealthy() |
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The core blocker from the previous review is still present. checkFuseHealthy() delegates to ctrl.Helper.CheckAndSyncFuseStatus (see pkg/ctrl/fuse.go:60-61), which unconditionally sets ready = true with the comment "fluid assumes fuse components are always ready".
As a result, CheckRuntimeReady() can never detect an unhealthy fuse, and the CI test "when fuse is not ready -- returns false" (health_check_test.go:770) keeps failing.
To fix this you could:
- Add a dedicated fuse-readiness check in
CheckRuntimeReadythat inspectsDaemonSetStatus.NumberUnavailabledirectly, rather than reusingcheckFuseHealthy()which is designed for the existing always-ready semantics. - Or override the behaviour in a thin-specific helper.
Changing CheckAndSyncFuseStatus globally would affect all runtimes, so a thin-local approach is probably safer.
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| ready := engine.CheckRuntimeReady() | ||
| Expect(ready).To(BeFalse()) |
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The unittest CI check fails because this test expects CheckRuntimeReady() to return false when fuse is unhealthy, but the underlying checkFuseHealthy() always returns true. The test correctly expresses the desired behavior; the production code needs to be updated to match it.
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| // TODO(cache runtime): figure out how to use this selector | ||
| // runtimeToUpdate.Status.Selector = e.getWorkerSelectors() | ||
| runtimeToUpdate.Status.Selector = e.getWorkerSelectors() |
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Maintainer @xliuqq asked whether the Status.Selector field should be removed entirely rather than populated, since it is currently unused across all runtimes. Please resolve that discussion before pushing additional commits for these cache engine changes.
| //TODO implement me | ||
| workerReady, err := t.CheckWorkersReady() | ||
| if err != nil || !workerReady { | ||
| return false |
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Consider adding t.Log.Info("runtime not ready", "workerReady", workerReady, "err", err) before returning false, matching the pattern used in AlluxioEngine and JindoEngine. This will help operators debug readiness issues.
…state CheckRuntimeReady() was an unimplemented stub that unconditionally returned true, causing data operations to be dispatched against a ThinRuntime even when workers were not ready. Implement it using CheckWorkersReady() — the same helper used by CheckRuntimeHealthy(). Fuse readiness is intentionally excluded because fluid treats fuse components as always-ready by design (see pkg/ctrl/fuse.go: "fluid assumes fuse components are always ready"). ThinRuntime has no master pod so the Alluxio/Jindo approach of probing master pod responsiveness does not apply. Also adds logging before returning false, matching the pattern used by AlluxioEngine and JindoEngine. Fixes fluid-cloudnative#6060 Signed-off-by: Aditya Upasani <adityaupasani29@gmail.com>
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Addressed all three review points:
Also removed the unrelated CacheEngine selector commit that was accidentally on this branch — that change is already in its own PR #6064. /assign @cheyang |
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Round 4 — real progress on the code, but CI is still red. What is good now:
The one remaining blocker: your comment says the two fuse tests were removed, but On @xliuqq's earlier question about removing |
| Expect(ready).To(BeFalse()) | ||
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| }) | ||
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The architectural fix in runtime_info.go is right and matches what fluid does elsewhere (pkg/ctrl/fuse.go hard-codes fuse ready=true). The problem is this test file: your PR comment says the two fuse tests were removed, but Context("when fuse is not ready") at line 730 and Context("when fuse DaemonSet does not exist") at line 772 are still present in the diff. Both build a ThinRuntime with Spec: datav1alpha1.ThinRuntimeSpec{} (no Worker.Enabled), so isWorkerEnable() returns false, CheckWorkersReady() short-circuits to (true, nil), and CheckRuntimeReady() returns true. The assertions expect false. That is exactly what the CI log shows: Expected <bool>: true to be false at health_check_test.go:770 and :802. Delete the two contexts, or flip them to Expect(ready).To(BeTrue()) and rename them to document the intentional 'fuse is always ready' behavior.
| Expect(count).To(BeEmpty()) | ||
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Once the failing tests are cleaned up, a small It() that builds a ThinRuntime with Spec.Worker.Enabled = false and asserts CheckRuntimeReady() returns true would document the intentional short-circuit in CheckWorkersReady and guard against future regressions.
Replace the two failing fuse test cases ("when fuse is not ready" and
"when fuse DaemonSet does not exist") with a single test that correctly
documents the intentional behavior:
- fluid treats fuse as always-ready by design (pkg/ctrl/fuse.go:
"fluid assumes fuse components are always ready")
- ThinRuntime with no worker enabled short-circuits CheckWorkersReady()
to (true, nil), so CheckRuntimeReady() returns true
The previous tests expected BeFalse() but the production code correctly
returns true in these cases. The new test guards against future
regressions by asserting BeTrue() with an explanatory comment.
Addresses cheyang review comment on fluid-cloudnative#6062
Signed-off-by: Aditya Upasani <adityaupasani29@gmail.com>
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Additional details and impacted files@@ Coverage Diff @@
## master #6062 +/- ##
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- Coverage 64.89% 64.78% -0.11%
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Files 486 484 -2
Lines 34057 33895 -162
==========================================
- Hits 22101 21960 -141
+ Misses 10228 10212 -16
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/copilot review |
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@gemini-code-assist /review |
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Code Review
This pull request implements the CheckRuntimeReady method for ThinEngine in pkg/ddc/thin/runtime_info.go to determine readiness based on worker availability, along with corresponding unit tests in pkg/ddc/thin/health_check_test.go. The reviewer suggested simplifying the implementation of CheckRuntimeReady by directly returning the result of CheckWorkersReady() (if no error occurs) to avoid duplicate logging, as the helper method already handles logging for both error and unready states.
Important
The consumer version of Gemini Code Assist on GitHub is being sunset. Starting June 18, 2026, new organization installations will be blocked, and all code review activity will officially cease on July 17, 2026.
For more details on the timeline and next steps, please review the Help Documentation.
| workerReady, err := t.CheckWorkersReady() | ||
| if err != nil { | ||
| t.Log.Error(err, "failed to check worker readiness") | ||
| return false | ||
| } | ||
| if !workerReady { | ||
| t.Log.Info("runtime not ready", "reason", "workers not ready") | ||
| return false | ||
| } | ||
| return true |
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The CheckWorkersReady() helper already logs both the error case (at Error level) and the "not ready" case (at Info level). Logging them again here in CheckRuntimeReady() results in duplicate logs and log pollution in the controller.
We can simplify this method by directly returning the result of CheckWorkersReady() and letting it handle the logging.
| workerReady, err := t.CheckWorkersReady() | |
| if err != nil { | |
| t.Log.Error(err, "failed to check worker readiness") | |
| return false | |
| } | |
| if !workerReady { | |
| t.Log.Info("runtime not ready", "reason", "workers not ready") | |
| return false | |
| } | |
| return true | |
| workerReady, err := t.CheckWorkersReady() | |
| if err != nil { | |
| return false | |
| } | |
| return workerReady |
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Round 5 — round-4 blocker resolved and CI is green. What changed since round 4 (commit 9448a59):
CI status: all 23 checks are @xliuqq's earlier From a review standpoint this is now clean. Deferring |
CheckWorkersReady() already logs both the error case and the not-ready case internally. The extra Log.Error and Log.Info calls in CheckRuntimeReady were redundant and caused duplicate log entries. Simplify to directly return the result of CheckWorkersReady(). Addresses Gemini review comment on fluid-cloudnative#6062 Signed-off-by: Aditya Upasani <adityaupasani29@gmail.com>
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Addressed the Gemini review comment — removed the duplicate logging. /assign @cheyang |
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Pull request overview
Implements ThinEngine.CheckRuntimeReady() so data operations can be gated on ThinRuntime readiness instead of the previous unconditional true, and adds unit tests around the new readiness behavior.
Changes:
- Replaces the
CheckRuntimeReady()stub with a worker-based readiness check. - Adds Ginkgo tests intended to validate
CheckRuntimeReady()behavior.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| pkg/ddc/thin/runtime_info.go | Implements ThinEngine.CheckRuntimeReady() (currently only checks workers). |
| pkg/ddc/thin/health_check_test.go | Adds a new CheckRuntimeReady test suite. |
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| // CheckRuntimeReady checks if the ThinRuntime is ready to serve data operations. | ||
| // Unlike Alluxio/Jindo which probe a master pod, ThinRuntime has no master component, | ||
| // so readiness is determined by worker availability. Fuse components are intentionally | ||
| // excluded because fluid treats fuse as always-ready by design (see pkg/ctrl/fuse.go). | ||
| func (t *ThinEngine) CheckRuntimeReady() (ready bool) { |
| Describe("CheckRuntimeReady", func() { | ||
| Context("when workers and fuse are both ready", func() { | ||
| It("returns true", func() { | ||
| healthyFuse := &appsv1.DaemonSet{ |
| Context("when worker is disabled (fuse-only runtime)", func() { | ||
| It("returns true because fluid treats fuse as always-ready", func() { | ||
| // ThinRuntime with no worker enabled: isWorkerEnable() returns false, | ||
| // so CheckWorkersReady() short-circuits to (true, nil). | ||
| // Fuse is intentionally excluded from CheckRuntimeReady because | ||
| // fluid assumes fuse components are always ready (pkg/ctrl/fuse.go). | ||
| runtimeObj := &datav1alpha1.ThinRuntime{ |
| // Unlike Alluxio/Jindo which probe a master pod, ThinRuntime has no master component, | ||
| // so readiness is determined by worker availability. Fuse components are intentionally | ||
| // excluded because fluid treats fuse as always-ready by design (see pkg/ctrl/fuse.go). | ||
| func (t *ThinEngine) CheckRuntimeReady() (ready bool) { |
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ThinRuntime is typically fuse-only in production — Spec.Worker.Enabled defaults to false and most users never set it. In that common case, isWorkerEnable() returns false, CheckWorkersReady() short-circuits to (true, nil), and CheckRuntimeReady() here returns true unconditionally — before anything about the runtime has actually been verified.
That doesn't really match what callers of CheckRuntimeReady() expect. Downstream gates (DataLoad, DataMigrate) will proceed as if the runtime is fully set up, even when the fuse DaemonSet hasn't been created yet or the mount-profile ConfigMap isn't ready.
Two ways to close this:
- Keep the "fuse always ready" invariant, but still verify the fuse DaemonSet object exists / the mount-profile ConfigMap has been generated — instead of blindly returning
truefor the worker-less case. - Probe the fuse DS the way
Helper.CheckAndSyncFuseStatusdoes. That's closer to how Alluxio probes its master, and fits the "no master, no worker, only fuse" reality of ThinRuntime.
The doc comment "readiness is determined by worker availability" also frames worker-mode as the primary path — for ThinRuntime it's the exception. Worth being explicit that with Worker.Enabled=false (the common case), this currently returns true unconditionally.
Ⅰ. Describe what this PR does
ThinEngine.CheckRuntimeReady()inpkg/ddc/thin/runtime_info.gowas an unimplemented stub that unconditionally returnedtrue:This caused data operations (DataLoad, DataMigrate, DataProcess) to be dispatched against a ThinRuntime even when workers and FUSE pods were not actually ready, potentially causing failures.
Implements it using the existing
CheckWorkersReady()andcheckFuseHealthy()helpers that are already used byCheckRuntimeHealthy(), so all readiness signals are consistent.Ⅱ. Does this pull request fix one issue?
Fixes #6060
Ⅲ. List the added test cases
Added 4 tests in
health_check_test.go:truefalsefalsefalseⅣ. Describe how to verify it
Run
go test ./pkg/ddc/thin/... -run CheckRuntimeReady -vⅤ. Special notes for reviews
The implementation mirrors
CheckRuntimeHealthy()exactly but returns a bool instead of an error, which is what thedataoperation.OperationInterfacecontract requires.