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feat: keep restart-instance task open until complete - #471
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📝 WalkthroughWalkthroughThe restart workflow captures a baseline postmaster start time, checks restart completion against the scheduled time, and attempts to cancel a scheduled restart during workflow cancellation. End-to-end tests check completion and cancellation. ChangesScheduled restart workflow
Merge Risk: 🟡 Moderate · up to A task can report a scheduled restart complete after a different restart, and the cancellation test may miss a retained schedule. Resolve these risks before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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| Category | Results |
|---|---|
| Complexity | 2 medium |
🟢 Metrics 46 complexity · 2 duplication
Metric Results Complexity 46 Duplication 2
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Inline comments:
In `@server/internal/workflows/activities/restart_instance.go`:
- Around line 166-173: Reset errCount to zero after a successful
patroniClient.GetInstanceStatus call in the restart polling flow, before
processing the returned status. Preserve the existing consecutive-error
threshold and failure behavior for repeated unsuccessful requests.
- Around line 64-68: Update the baseline status handling in the restart activity
around GetInstanceStatus: return the wrapped retrieval error when the call
fails, and return an error when PostmasterStartTime is nil instead of proceeding
with an empty baseline. Only schedule the restart and invoke
WaitForRestartComplete after assigning a valid baselinePostmasterStartTime.
In `@server/internal/workflows/restart_instance.go`:
- Around line 37-42: Track whether this workflow successfully created a
scheduled restart by setting a restartScheduled flag after
ExecuteRestartInstance succeeds, based on input.ScheduledAt being non-zero. In
the cancellation cleanup defer, construct and dispatch CancelRestart only when
restartScheduled is true; preserve the existing warning on cancellation
failures.
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e2e/restart_instance_scheduled_test.goserver/internal/patroni/client.goserver/internal/workflows/activities/activities.goserver/internal/workflows/activities/restart_instance.goserver/internal/workflows/restart_instance.go
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| if !status.InRunningState() || status.PostmasterStartTime == nil { | ||
| continue | ||
| } | ||
| if *status.PostmasterStartTime == input.BaselinePostmasterStartTime { |
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To know when the restart finished, the code notes the database start time before scheduling, then waits for that value to change. But any restart changes it. If the database restarts for another reason while waiting, a failover for example, the code thinks our scheduled restart is done when it has not happened.
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PostmasterStartTime is actually the "before" value, but the name sounds like the current one. BaselinePostmasterStartTime would read better.
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The waiting step runs for every restart, not only scheduled ones. So a normal restart now also keeps its task open until the database is properly back. That is arguably better, but the PR title only mentions scheduled restarts, and anyone relying on the old quick finish will notice. |
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Inline comments:
In `@server/internal/workflows/activities/restart_instance.go`:
- Line 28: Update the activity-result decoding around
BaselinePostmasterStartTime to accept the former postmaster_start_time field and
map it to the baseline value, preserving the baseline during replay of older
histories.
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server/internal/workflows/activities/restart_instance.goserver/internal/workflows/restart_instance.go
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Inline comments:
In `@e2e/restart_instance_scheduled_test.go`:
- Line 156: Update the cancellation-check deadline in the scheduled restart test
to subtract skew from scheduledAt before adding the 20-second buffer, so the
host-time deadline accounts for server time minus host time.
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⛔ Files ignored due to path filters (9)
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📒 Files selected for processing (3)
api/apiv1/design/api.goe2e/restart_instance_scheduled_test.goserver/internal/workflows/activities/restart_instance.go
💤 Files with no reviewable changes (1)
- api/apiv1/design/api.go
🚧 Files skipped from review as they are similar to previous changes (1)
- server/internal/workflows/activities/restart_instance.go
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Summary
This PR ensures that a scheduled restart task remains open until the restart actually completes and can be cancelled while waiting, instead of being marked complete as soon as Patroni acknowledges the scheduling request.
Changes
restart_instance.go(workflow): after requesting the restart, sleepuntil
scheduled_at(if set), then poll the instance via a new activityuntil the restart is confirmed complete, before marking the task done.
activities/restart_instance.go: capture a baselinepg_postmaster_start_timebefore scheduling; addWaitForRestartComplete(cancellable poll loop, using the same task-watcher pattern as
ApplyEvent) andCancelRestart(calls Patroni'sDELETE /restart)activities.
CancelRestartagainstPatroni, so cancelling the task actually drops the schedule instead of
only updating local task bookkeeping.
e2e/restart_instance_scheduled_test.go(new): covers a scheduledrestart staying open until completion, and being cancellable mid-wait.
Testing
Verified:
Checklist
PLAT-203