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hjoliver avatar hjoliver commented on June 11, 2024

This new block is the cause, but I haven't figured out exactly what's going on:

cylc-flow/cylc/flow/scheduler.py

Lines 1089 to 1112 in a965b91

# flush out preparing tasks before attempting reload
self.reload_pending = 'waiting for pending tasks to submit'
while self.release_queued_tasks():
# Run the subset of main-loop functionality required to push
# preparing through the submission pipeline and keep the workflow
# responsive (e.g. to the `cylc stop` command).
# NOTE: this reload method was called by process_command_queue
# which is called synchronously in the main loop so this call is
# blocking to other main loop functions
# subproc pool - for issueing/tracking remote-init commands
self.proc_pool.process()
# task messages - for tracking task status changes
self.process_queued_task_messages()
# command queue - keeps the scheduler responsive
await self.process_command_queue()
# allows the scheduler to shutdown --now
await self.workflow_shutdown()
# keep the data store up to date with what's going on
await self.update_data_structure()
self.update_data_store()
# give commands time to complete
sleep(1) # give any remove-init's time to complete

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hjoliver avatar hjoliver commented on June 11, 2024

Ah, some progress. It's because the same job gets submitted twice! (Not double-handling of queued commands during reload as I initially thought).

It only happens if the task state hasn't updated yet, after job submission. So not a very serious bug after all, but still a bug.

Workaround:

script = """
    cylc__job__wait_cylc_message_started
    cylc reload $CYLC_WORKFLOW_ID
"""

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oliver-sanders avatar oliver-sanders commented on June 11, 2024

It only happens if the task state hasn't updated yet

hmm, fishy. What state was the task in at this point? preparing or submitted?

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