resolve mutual dependency in flink via dataflow
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@ -369,22 +369,8 @@ The JobManager then performs the job and, when finished, asserts (job-finished I
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(match-define (task $this-id $desc) t)
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(log "JM begins on task ~a" this-id)
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(define (∀ (ρ2) (select-a-task-manager [assign-task : (proc ID -> ★/t
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#:roles (ρ2))]))
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(start-facet this-facet
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(begin/dataflow
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(define mngr?
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(for/first ([(id slots) (ref task-managers)]
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#:when (positive? (- slots (hash-ref/failure (ref requests-in-flight) id 0))))
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id))
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(match mngr?
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[(some $mngr)
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(take-slot! mngr)
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(stop this-facet
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(assign-task mngr))]
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[none
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#f])
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#f)))
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(define not-a-real-task-manager (gensym 'FAKE))
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(field [task-mngr ID not-a-real-task-manager])
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;; ID -> ...
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(define (assign-task [mngr : ID])
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@ -392,7 +378,8 @@ The JobManager then performs the job and, when finished, asserts (job-finished I
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(assert (task-assignment mngr job-id t))
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(on (retracted (task-manager mngr discard))
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;; our task manager has crashed
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(stop this-facet #;(select-a-task-manager)))
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(stop this-facet
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(set! task-mngr not-a-real-task-manager)))
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(on start
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;; N.B. when this line was here, and not after `(when mngr ...)` above,
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;; things didn't work. I think that due to script scheduling, all ready
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@ -411,12 +398,29 @@ The JobManager then performs the job and, when finished, asserts (job-finished I
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;; don't think we need a release-slot! here, because if we've heard back from a task manager,
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;; they should have told us a different slot count since we tried to give them work
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(log "JM overloaded manager ~a with task ~a" mngr this-id)
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(stop this-facet #;(select-a-task-manager))]
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(stop this-facet
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(set! task-mngr not-a-real-task-manager))]
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[(finished $results)
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(log "JM receives the results of task ~a" this-id)
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(stop perform (k this-id results))]))))
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(on start (select-a-task-manager assign-task))))
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(define (select-a-task-manager)
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(start-facet this-facet
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(begin/dataflow
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(when (equal? (ref task-mngr) not-a-real-task-manager)
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(define mngr?
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(for/first ([(id slots) (ref task-managers)]
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#:when (positive? (- slots (hash-ref/failure (ref requests-in-flight) id 0))))
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id))
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(match mngr?
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[(some $mngr)
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(take-slot! mngr)
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(set! task-mngr mngr)
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(assign-task mngr)]
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[none
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#f])))))
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(on start (select-a-task-manager))))
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(begin/dataflow
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(define slots (slots-available))
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