replace some dataflow with internal events in typed flink
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@ -219,7 +219,7 @@ The JobManager then performs the job and, when finished, asserts (job-finished I
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(define (spawn-task-manager)
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(define id (gensym 'task-manager))
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(spawn τc
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(print-role
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(begin
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(start-facet tm
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(log "Task Manager (TM) ~a is running" id)
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(during (job-manager-alive)
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@ -320,9 +320,12 @@ The JobManager then performs the job and, when finished, asserts (job-finished I
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[(task $id (reduce-work $l $r))
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(task id (reduce-work (left l) (left r)))]))
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(assertion-struct assigned-task : SelectedTM (mngr))
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(message-struct tasks-finished : TasksFinished (id))
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(define (spawn-job-manager)
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(spawn τc
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(begin
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(print-role
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(start-facet jm
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(assert (job-manager-alive))
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(log "Job Manager Up")
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@ -375,6 +378,7 @@ The JobManager then performs the job and, when finished, asserts (job-finished I
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(empty? (ref ready-tasks))
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(empty? (ref waiting-tasks)))
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(log "JM finished with job ~a" job-id)
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(realize! (tasks-finished job-id))
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(start-facet done (assert (job-finished job-id data)))]
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[else
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;; TODO - in MapReduce, there should be either 1 waiting task, or 0, meaning the job is done.
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@ -408,10 +412,10 @@ The JobManager then performs the job and, when finished, asserts (job-finished I
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(define (assign-task [mngr : ID])
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(start-facet assign
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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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(know (assigned-task mngr))
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(on (retracted (task-manager mngr _))
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;; our task manager has crashed
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(stop assign
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(set! task-mngr not-a-real-task-manager)))
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(stop assign))
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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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@ -430,39 +434,52 @@ 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 assign
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(set! task-mngr not-a-real-task-manager))]
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(stop assign)]
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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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(define (select-a-task-manager)
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(start-facet select
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(field [mngr (Maybe ID) none])
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(define (try-assign!)
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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 $m)
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(take-slot! m)
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(set! mngr (some m))
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(assign-task m)]
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[none
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#f]))
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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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(when (equal? (ref mngr) none)
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(try-assign!)))
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(on (forget (assigned-task $m:ID))
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(when (equal? (some m) (ref mngr))
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(set! mngr none)))))
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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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(define-tuple (ts readys)
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(split-at/lenient (ref ready-tasks) slots))
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(for ([t ts])
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(perform-task t push-results))
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(unless (empty? ts)
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;; the empty? check may be necessary to avoid a dataflow loop
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(set! ready-tasks readys))))))))
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(on start
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(start-facet delegate-tasks
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(on (realize (tasks-finished job-id))
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(stop delegate-tasks))
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(begin/dataflow
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(define slots (slots-available))
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(define-tuple (ts readys)
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(split-at/lenient (ref ready-tasks) slots))
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(for ([t ts])
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(perform-task t push-results))
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(unless (empty? ts)
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;; the empty? check may be necessary to avoid a dataflow loop
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(set! ready-tasks readys))))))))))
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;; ---------------------------------------------------------------------------------------------------
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;; Client
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@ -492,5 +509,5 @@ The JobManager then performs the job and, when finished, asserts (job-finished I
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(spawn-task-manager)
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(spawn-task-runner)
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(spawn-task-runner)
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#;(spawn-client (file->job "lorem.txt"))
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(spawn-client (file->job "lorem.txt"))
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(spawn-client (string->job INPUT)))
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