2c71bcda32
Remove SELECT FOR UPDATE from job dispatch to reduce transaction rollbacks
Move status transition from BaseTask.transition_status (which used
SELECT FOR UPDATE inside transaction.atomic()) into
dispatch_waiting_jobs. The new approach uses filter().update() which
is atomic at the database level without requiring explicit row locks,
reducing transaction contention and rollbacks observed in perfscale
testing.
The transition_status method was an artifact of the feature flag era
where we needed to support both old and new code paths. Since
dispatch_waiting_jobs is already a singleton
(on_duplicate='queue_one') scoped to the local node, the
de-duplication logic is unnecessary.
Status is updated after task submission to dispatcherd, so the job's
UUID is in the dispatch pipeline before being marked running —
preventing the reaper from incorrectly reaping jobs during the
handoff window. RunJob.run() handles the race where a worker picks
up the task before the status update lands by accepting waiting and
transitioning it to running itself.
Signed-off-by: Seth Foster <fosterbseth@gmail.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Caution
The last release of this repository was released on Jul 2, 2024. Releases of this project are now paused during a large scale refactoring. For more information, follow the Forum and - more specifically - see the various communications on the matter:
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