fix(workflow): charge crash recovery when a node starts, not when it queues - #3981
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…queues DAGExecutor raised a running node's attempt and fired onRecoveryScheduled while assembling the ready queue, before `ready.slice(0, maxConcurrency)` decided what actually runs. At maxConcurrency 1, a wait ahead of the recovered node parks and ends the pass, so the node never starts. Its recovery is spent anyway, and the next pass fails the whole run as out of budget for a step that has not executed once. Queue the node for recovery instead, and charge the attempt when it is admitted to a batch. The batch already writes every running node durably before it executes, so a worker that dies after admission still resumes against the raised count and stays bounded to one recovery. A node that never starts keeps its recovery for the next pass. This keeps the fail-closed behavior from #3940 intact: no run reports completion while a required node is still running or unexecuted. Closes veryfront/veryfront-issue-inbox#719
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📝 WalkthroughWalkthroughThe DAG executor now defers crash-recovery accounting until batch admission. Durable root runs persist admitted recovery attempts and ChangesCrash-recovery accounting
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟠 High · up to The change can still allow recovered child work to run again after a worker restart, potentially repeating side effects beyond the configured retry limit, and an ownership change during admission can consume a retry without executing the node. These are concrete correctness risks that should be fixed before merge. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Three guards the recovery-budget change did not have. A composite runs its children against a synthetic run that never persists, so only the top-level run has a durable write. The exhaustion check must not ride on that distinction: gating it on the durable run lets an out-of-budget child re-run its side effect inside the composite, and nothing caught that. The other two pin the budget to `attempt` alone. `startedAt` is optional on NodeState and `nodeStates` is a public input to `execute()`, so a third-party backend or an SDK caller can hand back a running node without it. Inferring "never started" from a missing timestamp gives such a node a second recovery and duplicates its side effect. The workflow-executor assertion pins the other half: charging at admission is what puts a start on the durable write a second worker resumes from.
DAGExecutor is not exported, so it is not the surface that produces a running node without a timestamp. WorkflowBackend is: it is exported, and createWorkflowClient accepts an implementation of it.
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Inline comments:
In `@src/workflow/executor/dag/index.ts`:
- Around line 143-149: Update the recovered-child admission flow around
isDurableRun and onRecoveryScheduled so every recovered child persists an
ownership-fenced full root-state admission record before execution, while
avoiding persistence of the synthetic child fragment as root state. Preserve
recovery budget behavior and add a restart test covering a child recovery that
dies after admission but before completion.
- Around line 279-294: Make recovery admission atomic in the recovered-node
loop: combine the state persisted by onRecoveryScheduled with the current
node-state update through one ownership-fenced write, so ownership loss prevents
any recovery attempt from being committed. Preserve the existing
ownership-change error behavior and abort handling. Add a test covering
successful onRecoveryScheduled followed by onNodeStatesChanged returning false,
verifying the recovery is not durably spent.
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src/workflow/executor/dag/index.test.tssrc/workflow/executor/dag/index.tssrc/workflow/executor/workflow-executor.test.ts
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Fixes veryfront/veryfront-issue-inbox#719. Follow-up to #3940, which fixed the
silent-success defect and left this narrower retry-accounting gap out of scope.
The defect
DAGExecutorraised a running node'sattemptand firedonRecoveryScheduledwhile assembling the ready queue, before
ready.slice(0, maxConcurrency)decidedwhat actually runs. Queueing is not starting. If an earlier node in the queue
parks on a wait, the recovered node never runs, but its recovery is already
spent.
Measured on
mainat9d6cdefb86, with a wait and an interrupted step atmaxConcurrency: 1:The run fails as unrecoverable for a step that never executed once.
The fix
Queue the node for recovery during assembly, and charge the attempt when the node
is admitted to a batch.
The early durable write exists so a second worker death is bounded, so the charge
cannot simply move after execution. It does not have to: the batch already writes
every running node durably before it executes (
publishNodeStates, thenPromise.allSettled). Charging at admission puts the raised count on the samedurable boundary the node's execution is already fenced by. A worker that dies
after admission resumes against
attempt: 2and is refused, exactly as before. Anode that never starts keeps
attempt: 1and its one recovery.onRecoveryScheduledmoves with it, so its ownership fence still runs before therecovered node executes.
After the fix:
#3940's invariant is unchanged: no run reports completion while a required node is
still
runningor unexecuted. The change only moves when the budget is charged,never whether it is.
Tests
Both directions, in
recovery from a worker that died mid-node:spends no recovery on a queued node that a parked wait stops from starting.The two-pass shape from the issue: crash-recovery pass, then approval-resume
pass. Asserts
onRecoveryScheduleddoes not fire in pass 1, the attempt stays1, and pass 2 runs the step and completes. It also pins Release v0.1.99 #715's invariant for
this shape: pass 1 returns
completed: falsewith the unexecuted step stillnamed
running.spends exactly one recovery on a node that does start, and bounds the next death. Asserts the durable write carriesattempt: 2, and that resuming fromit is refused with
retry budget exhaustedhaving executed nothing.Test 1 is red on
main:persistedAttemptsis[2], expected[].Test 2 is green on
mainby construction (it guards the behavior being kept), andred under the naive fix of dropping the increment: the durable attempt reads
undefined, expected2, and the second worker death re-runs the side effect.Supersedes #3992
#3992 fixed the same defect from the other side: it kept the eager charge and made
the reservation reusable by deleting
startedAtas a sentinel for "reserved, notstarted". On the #719 defect the two are equivalent. Mechanism-neutral tests run on
the merge base, on this head and on #3992's head agree on a parked wait ahead of an
interrupted node, on the bound after a resumed reservation, and on two interrupted
nodes competing for one slot: red on base, green on both.
The
startedAtsentinel is what separated them. A node persisted asrunningwithno
startedAtreads as merely reserved, so it is not charged and its ceiling widens,and it collects a second recovery that
mainrefuses. Measured: the side effect rantwice on #3992, once on base and once here.
startedAtis optional onNodeStateandWorkflowBackendis exported and accepted bycreateWorkflowClient, so a backendthat does not round-trip the timestamp produces exactly that state. #3992 is closed
with the detail on it.
Added after the comparison
b3a96e4cc7adds three guards this branch did not have, each proven red under atargeted mutation:
bounds a child graph's recovery too, not just the top-level run. A composite runsits children against a synthetic run that never persists. Gating the exhaustion
check on the durable run lets an out-of-budget child re-run its side effect inside
the composite. Nothing on either branch caught that.
still spends only one recovery when the interrupted state has no startedAt. Pinsthe budget to
attemptalone, so the sentinel fix(workflow): preserve queued recovery reservations #3992 used cannot come backunnoticed. Red under a mutation that charges only when
startedAtis present.assertExistson the persistedstartedAtinworkflow-executor.test.ts,carried over. Charging at admission is what puts a start on the durable write a
second worker resumes from. Red under a mutation that drops it.
Summary by CodeRabbit