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"""The Python scheduler for rich scheduling.
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The Pure ZMQ scheduler does not allow routing schemes other than LRU,
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nor does it check msg_id DAG dependencies. For those, a slightly slower
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Python Scheduler exists.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2010-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#----------------------------------------------------------------------
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# Imports
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#----------------------------------------------------------------------
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from __future__ import print_function
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import logging
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import sys
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from datetime import datetime, timedelta
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from random import randint, random
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from types import FunctionType
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try:
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import numpy
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except ImportError:
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numpy = None
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import zmq
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from zmq.eventloop import ioloop, zmqstream
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# local imports
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from IPython.external.decorator import decorator
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from IPython.config.loader import Config
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from IPython.utils.traitlets import Instance, Dict, List, Set, Int
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from IPython.parallel import error
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from IPython.parallel.factory import SessionFactory
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from IPython.parallel.util import connect_logger, local_logger
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from .dependency import Dependency
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@decorator
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def logged(f,self,*args,**kwargs):
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# print ("#--------------------")
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self.log.debug("scheduler::%s(*%s,**%s)"%(f.func_name, args, kwargs))
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# print ("#--")
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return f(self,*args, **kwargs)
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#----------------------------------------------------------------------
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# Chooser functions
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#----------------------------------------------------------------------
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def plainrandom(loads):
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"""Plain random pick."""
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n = len(loads)
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return randint(0,n-1)
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def lru(loads):
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"""Always pick the front of the line.
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The content of `loads` is ignored.
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Assumes LRU ordering of loads, with oldest first.
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"""
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return 0
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def twobin(loads):
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"""Pick two at random, use the LRU of the two.
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The content of loads is ignored.
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Assumes LRU ordering of loads, with oldest first.
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"""
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n = len(loads)
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a = randint(0,n-1)
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b = randint(0,n-1)
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return min(a,b)
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def weighted(loads):
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"""Pick two at random using inverse load as weight.
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Return the less loaded of the two.
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"""
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# weight 0 a million times more than 1:
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weights = 1./(1e-6+numpy.array(loads))
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sums = weights.cumsum()
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t = sums[-1]
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x = random()*t
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y = random()*t
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idx = 0
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idy = 0
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while sums[idx] < x:
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idx += 1
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while sums[idy] < y:
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idy += 1
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if weights[idy] > weights[idx]:
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return idy
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else:
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return idx
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def leastload(loads):
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"""Always choose the lowest load.
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If the lowest load occurs more than once, the first
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occurance will be used. If loads has LRU ordering, this means
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the LRU of those with the lowest load is chosen.
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"""
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return loads.index(min(loads))
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#---------------------------------------------------------------------
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# Classes
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#---------------------------------------------------------------------
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# store empty default dependency:
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MET = Dependency([])
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class TaskScheduler(SessionFactory):
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"""Python TaskScheduler object.
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This is the simplest object that supports msg_id based
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DAG dependencies. *Only* task msg_ids are checked, not
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msg_ids of jobs submitted via the MUX queue.
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"""
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hwm = Int(0, config=True) # limit number of outstanding tasks
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# input arguments:
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scheme = Instance(FunctionType, default=leastload) # function for determining the destination
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client_stream = Instance(zmqstream.ZMQStream) # client-facing stream
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engine_stream = Instance(zmqstream.ZMQStream) # engine-facing stream
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notifier_stream = Instance(zmqstream.ZMQStream) # hub-facing sub stream
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mon_stream = Instance(zmqstream.ZMQStream) # hub-facing pub stream
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# internals:
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graph = Dict() # dict by msg_id of [ msg_ids that depend on key ]
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retries = Dict() # dict by msg_id of retries remaining (non-neg ints)
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# waiting = List() # list of msg_ids ready to run, but haven't due to HWM
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depending = Dict() # dict by msg_id of (msg_id, raw_msg, after, follow)
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pending = Dict() # dict by engine_uuid of submitted tasks
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completed = Dict() # dict by engine_uuid of completed tasks
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failed = Dict() # dict by engine_uuid of failed tasks
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destinations = Dict() # dict by msg_id of engine_uuids where jobs ran (reverse of completed+failed)
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clients = Dict() # dict by msg_id for who submitted the task
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targets = List() # list of target IDENTs
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loads = List() # list of engine loads
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# full = Set() # set of IDENTs that have HWM outstanding tasks
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all_completed = Set() # set of all completed tasks
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all_failed = Set() # set of all failed tasks
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all_done = Set() # set of all finished tasks=union(completed,failed)
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all_ids = Set() # set of all submitted task IDs
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blacklist = Dict() # dict by msg_id of locations where a job has encountered UnmetDependency
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auditor = Instance('zmq.eventloop.ioloop.PeriodicCallback')
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def start(self):
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self.engine_stream.on_recv(self.dispatch_result, copy=False)
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self._notification_handlers = dict(
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registration_notification = self._register_engine,
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unregistration_notification = self._unregister_engine
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)
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self.notifier_stream.on_recv(self.dispatch_notification)
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self.auditor = ioloop.PeriodicCallback(self.audit_timeouts, 2e3, self.loop) # 1 Hz
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self.auditor.start()
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self.log.info("Scheduler started...%r"%self)
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def resume_receiving(self):
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"""Resume accepting jobs."""
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self.client_stream.on_recv(self.dispatch_submission, copy=False)
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def stop_receiving(self):
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"""Stop accepting jobs while there are no engines.
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Leave them in the ZMQ queue."""
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self.client_stream.on_recv(None)
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#-----------------------------------------------------------------------
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# [Un]Registration Handling
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#-----------------------------------------------------------------------
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def dispatch_notification(self, msg):
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"""dispatch register/unregister events."""
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idents,msg = self.session.feed_identities(msg)
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msg = self.session.unpack_message(msg)
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msg_type = msg['msg_type']
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handler = self._notification_handlers.get(msg_type, None)
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if handler is None:
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raise Exception("Unhandled message type: %s"%msg_type)
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else:
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try:
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handler(str(msg['content']['queue']))
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except KeyError:
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self.log.error("task::Invalid notification msg: %s"%msg)
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@logged
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def _register_engine(self, uid):
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"""New engine with ident `uid` became available."""
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# head of the line:
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self.targets.insert(0,uid)
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self.loads.insert(0,0)
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# initialize sets
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self.completed[uid] = set()
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self.failed[uid] = set()
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self.pending[uid] = {}
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if len(self.targets) == 1:
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self.resume_receiving()
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# rescan the graph:
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self.update_graph(None)
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def _unregister_engine(self, uid):
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"""Existing engine with ident `uid` became unavailable."""
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if len(self.targets) == 1:
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# this was our only engine
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self.stop_receiving()
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# handle any potentially finished tasks:
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self.engine_stream.flush()
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# don't pop destinations, because they might be used later
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# map(self.destinations.pop, self.completed.pop(uid))
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# map(self.destinations.pop, self.failed.pop(uid))
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# prevent this engine from receiving work
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idx = self.targets.index(uid)
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self.targets.pop(idx)
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self.loads.pop(idx)
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# wait 5 seconds before cleaning up pending jobs, since the results might
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# still be incoming
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if self.pending[uid]:
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dc = ioloop.DelayedCallback(lambda : self.handle_stranded_tasks(uid), 5000, self.loop)
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dc.start()
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else:
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self.completed.pop(uid)
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self.failed.pop(uid)
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@logged
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def handle_stranded_tasks(self, engine):
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"""Deal with jobs resident in an engine that died."""
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lost = self.pending[engine]
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for msg_id in lost.keys():
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if msg_id not in self.pending[engine]:
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# prevent double-handling of messages
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continue
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raw_msg = lost[msg_id][0]
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|
idents,msg = self.session.feed_identities(raw_msg, copy=False)
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msg = self.session.unpack_message(msg, copy=False, content=False)
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parent = msg['header']
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idents = [engine, idents[0]]
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|
# build fake error reply
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try:
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raise error.EngineError("Engine %r died while running task %r"%(engine, msg_id))
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except:
|
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|
content = error.wrap_exception()
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msg = self.session.msg('apply_reply', content, parent=parent, subheader={'status':'error'})
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raw_reply = map(zmq.Message, self.session.serialize(msg, ident=idents))
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# and dispatch it
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self.dispatch_result(raw_reply)
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# finally scrub completed/failed lists
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self.completed.pop(engine)
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self.failed.pop(engine)
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#-----------------------------------------------------------------------
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|
|
# Job Submission
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|
#-----------------------------------------------------------------------
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@logged
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def dispatch_submission(self, raw_msg):
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"""Dispatch job submission to appropriate handlers."""
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# ensure targets up to date:
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self.notifier_stream.flush()
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try:
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idents, msg = self.session.feed_identities(raw_msg, copy=False)
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msg = self.session.unpack_message(msg, content=False, copy=False)
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except Exception:
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self.log.error("task::Invaid task: %s"%raw_msg, exc_info=True)
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return
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# send to monitor
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self.mon_stream.send_multipart(['intask']+raw_msg, copy=False)
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header = msg['header']
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msg_id = header['msg_id']
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self.all_ids.add(msg_id)
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# targets
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targets = set(header.get('targets', []))
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retries = header.get('retries', 0)
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self.retries[msg_id] = retries
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|
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# time dependencies
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after = Dependency(header.get('after', []))
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if after.all:
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if after.success:
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after.difference_update(self.all_completed)
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if after.failure:
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after.difference_update(self.all_failed)
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if after.check(self.all_completed, self.all_failed):
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|
# recast as empty set, if `after` already met,
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|
# to prevent unnecessary set comparisons
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after = MET
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|
|
|
# location dependencies
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|
|
follow = Dependency(header.get('follow', []))
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|
|
|
# turn timeouts into datetime objects:
|
|
|
timeout = header.get('timeout', None)
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|
if timeout:
|
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|
timeout = datetime.now() + timedelta(0,timeout,0)
|
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|
|
|
args = [raw_msg, targets, after, follow, timeout]
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|
|
|
# validate and reduce dependencies:
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|
|
for dep in after,follow:
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|
# check valid:
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|
|
if msg_id in dep or dep.difference(self.all_ids):
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|
self.depending[msg_id] = args
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return self.fail_unreachable(msg_id, error.InvalidDependency)
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|
|
# check if unreachable:
|
|
|
if dep.unreachable(self.all_completed, self.all_failed):
|
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|
self.depending[msg_id] = args
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|
return self.fail_unreachable(msg_id)
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|
|
|
if after.check(self.all_completed, self.all_failed):
|
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|
# time deps already met, try to run
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|
|
if not self.maybe_run(msg_id, *args):
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# can't run yet
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|
if msg_id not in self.all_failed:
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# could have failed as unreachable
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self.save_unmet(msg_id, *args)
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else:
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self.save_unmet(msg_id, *args)
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|
# @logged
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|
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def audit_timeouts(self):
|
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|
"""Audit all waiting tasks for expired timeouts."""
|
|
|
now = datetime.now()
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|
|
for msg_id in self.depending.keys():
|
|
|
# must recheck, in case one failure cascaded to another:
|
|
|
if msg_id in self.depending:
|
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|
raw,after,targets,follow,timeout = self.depending[msg_id]
|
|
|
if timeout and timeout < now:
|
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|
self.fail_unreachable(msg_id, error.TaskTimeout)
|
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|
|
|
|
@logged
|
|
|
def fail_unreachable(self, msg_id, why=error.ImpossibleDependency):
|
|
|
"""a task has become unreachable, send a reply with an ImpossibleDependency
|
|
|
error."""
|
|
|
if msg_id not in self.depending:
|
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|
self.log.error("msg %r already failed!"%msg_id)
|
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|
return
|
|
|
raw_msg,targets,after,follow,timeout = self.depending.pop(msg_id)
|
|
|
for mid in follow.union(after):
|
|
|
if mid in self.graph:
|
|
|
self.graph[mid].remove(msg_id)
|
|
|
|
|
|
# FIXME: unpacking a message I've already unpacked, but didn't save:
|
|
|
idents,msg = self.session.feed_identities(raw_msg, copy=False)
|
|
|
msg = self.session.unpack_message(msg, copy=False, content=False)
|
|
|
header = msg['header']
|
|
|
|
|
|
try:
|
|
|
raise why()
|
|
|
except:
|
|
|
content = error.wrap_exception()
|
|
|
|
|
|
self.all_done.add(msg_id)
|
|
|
self.all_failed.add(msg_id)
|
|
|
|
|
|
msg = self.session.send(self.client_stream, 'apply_reply', content,
|
|
|
parent=header, ident=idents)
|
|
|
self.session.send(self.mon_stream, msg, ident=['outtask']+idents)
|
|
|
|
|
|
self.update_graph(msg_id, success=False)
|
|
|
|
|
|
@logged
|
|
|
def maybe_run(self, msg_id, raw_msg, targets, after, follow, timeout):
|
|
|
"""check location dependencies, and run if they are met."""
|
|
|
blacklist = self.blacklist.setdefault(msg_id, set())
|
|
|
if follow or targets or blacklist or self.hwm:
|
|
|
# we need a can_run filter
|
|
|
def can_run(idx):
|
|
|
# check hwm
|
|
|
if self.hwm and self.loads[idx] == self.hwm:
|
|
|
return False
|
|
|
target = self.targets[idx]
|
|
|
# check blacklist
|
|
|
if target in blacklist:
|
|
|
return False
|
|
|
# check targets
|
|
|
if targets and target not in targets:
|
|
|
return False
|
|
|
# check follow
|
|
|
return follow.check(self.completed[target], self.failed[target])
|
|
|
|
|
|
indices = filter(can_run, range(len(self.targets)))
|
|
|
|
|
|
if not indices:
|
|
|
# couldn't run
|
|
|
if follow.all:
|
|
|
# check follow for impossibility
|
|
|
dests = set()
|
|
|
relevant = set()
|
|
|
if follow.success:
|
|
|
relevant = self.all_completed
|
|
|
if follow.failure:
|
|
|
relevant = relevant.union(self.all_failed)
|
|
|
for m in follow.intersection(relevant):
|
|
|
dests.add(self.destinations[m])
|
|
|
if len(dests) > 1:
|
|
|
self.depending[msg_id] = (raw_msg, targets, after, follow, timeout)
|
|
|
self.fail_unreachable(msg_id)
|
|
|
return False
|
|
|
if targets:
|
|
|
# check blacklist+targets for impossibility
|
|
|
targets.difference_update(blacklist)
|
|
|
if not targets or not targets.intersection(self.targets):
|
|
|
self.depending[msg_id] = (raw_msg, targets, after, follow, timeout)
|
|
|
self.fail_unreachable(msg_id)
|
|
|
return False
|
|
|
return False
|
|
|
else:
|
|
|
indices = None
|
|
|
|
|
|
self.submit_task(msg_id, raw_msg, targets, follow, timeout, indices)
|
|
|
return True
|
|
|
|
|
|
@logged
|
|
|
def save_unmet(self, msg_id, raw_msg, targets, after, follow, timeout):
|
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"""Save a message for later submission when its dependencies are met."""
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self.depending[msg_id] = [raw_msg,targets,after,follow,timeout]
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# track the ids in follow or after, but not those already finished
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for dep_id in after.union(follow).difference(self.all_done):
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if dep_id not in self.graph:
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self.graph[dep_id] = set()
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self.graph[dep_id].add(msg_id)
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@logged
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def submit_task(self, msg_id, raw_msg, targets, follow, timeout, indices=None):
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"""Submit a task to any of a subset of our targets."""
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if indices:
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loads = [self.loads[i] for i in indices]
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else:
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loads = self.loads
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idx = self.scheme(loads)
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if indices:
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idx = indices[idx]
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target = self.targets[idx]
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# print (target, map(str, msg[:3]))
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# send job to the engine
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self.engine_stream.send(target, flags=zmq.SNDMORE, copy=False)
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self.engine_stream.send_multipart(raw_msg, copy=False)
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# update load
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self.add_job(idx)
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self.pending[target][msg_id] = (raw_msg, targets, MET, follow, timeout)
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# notify Hub
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content = dict(msg_id=msg_id, engine_id=target)
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self.session.send(self.mon_stream, 'task_destination', content=content,
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ident=['tracktask',self.session.session])
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#-----------------------------------------------------------------------
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# Result Handling
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#-----------------------------------------------------------------------
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@logged
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def dispatch_result(self, raw_msg):
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"""dispatch method for result replies"""
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try:
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idents,msg = self.session.feed_identities(raw_msg, copy=False)
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msg = self.session.unpack_message(msg, content=False, copy=False)
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engine = idents[0]
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try:
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idx = self.targets.index(engine)
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except ValueError:
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pass # skip load-update for dead engines
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else:
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self.finish_job(idx)
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except Exception:
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self.log.error("task::Invaid result: %s"%raw_msg, exc_info=True)
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return
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header = msg['header']
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parent = msg['parent_header']
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if header.get('dependencies_met', True):
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success = (header['status'] == 'ok')
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msg_id = parent['msg_id']
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retries = self.retries[msg_id]
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if not success and retries > 0:
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# failed
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self.retries[msg_id] = retries - 1
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self.handle_unmet_dependency(idents, parent)
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else:
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del self.retries[msg_id]
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# relay to client and update graph
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self.handle_result(idents, parent, raw_msg, success)
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# send to Hub monitor
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self.mon_stream.send_multipart(['outtask']+raw_msg, copy=False)
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else:
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self.handle_unmet_dependency(idents, parent)
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@logged
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def handle_result(self, idents, parent, raw_msg, success=True):
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"""handle a real task result, either success or failure"""
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# first, relay result to client
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engine = idents[0]
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client = idents[1]
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# swap_ids for XREP-XREP mirror
|
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raw_msg[:2] = [client,engine]
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|
# print (map(str, raw_msg[:4]))
|
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|
self.client_stream.send_multipart(raw_msg, copy=False)
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|
# now, update our data structures
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|
msg_id = parent['msg_id']
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self.blacklist.pop(msg_id, None)
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self.pending[engine].pop(msg_id)
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|
if success:
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|
self.completed[engine].add(msg_id)
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self.all_completed.add(msg_id)
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|
else:
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|
self.failed[engine].add(msg_id)
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self.all_failed.add(msg_id)
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|
self.all_done.add(msg_id)
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|
self.destinations[msg_id] = engine
|
|
|
|
|
|
self.update_graph(msg_id, success)
|
|
|
|
|
|
@logged
|
|
|
def handle_unmet_dependency(self, idents, parent):
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|
"""handle an unmet dependency"""
|
|
|
engine = idents[0]
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|
|
msg_id = parent['msg_id']
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|
|
|
|
|
if msg_id not in self.blacklist:
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|
self.blacklist[msg_id] = set()
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|
|
self.blacklist[msg_id].add(engine)
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|
|
|
|
args = self.pending[engine].pop(msg_id)
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|
|
raw,targets,after,follow,timeout = args
|
|
|
|
|
|
if self.blacklist[msg_id] == targets:
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|
|
self.depending[msg_id] = args
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|
|
self.fail_unreachable(msg_id)
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|
|
elif not self.maybe_run(msg_id, *args):
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|
|
# resubmit failed
|
|
|
if msg_id not in self.all_failed:
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|
|
# put it back in our dependency tree
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|
|
self.save_unmet(msg_id, *args)
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|
|
|
|
|
if self.hwm:
|
|
|
try:
|
|
|
idx = self.targets.index(engine)
|
|
|
except ValueError:
|
|
|
pass # skip load-update for dead engines
|
|
|
else:
|
|
|
if self.loads[idx] == self.hwm-1:
|
|
|
self.update_graph(None)
|
|
|
|
|
|
|
|
|
|
|
|
@logged
|
|
|
def update_graph(self, dep_id=None, success=True):
|
|
|
"""dep_id just finished. Update our dependency
|
|
|
graph and submit any jobs that just became runable.
|
|
|
|
|
|
Called with dep_id=None to update entire graph for hwm, but without finishing
|
|
|
a task.
|
|
|
"""
|
|
|
# print ("\n\n***********")
|
|
|
# pprint (dep_id)
|
|
|
# pprint (self.graph)
|
|
|
# pprint (self.depending)
|
|
|
# pprint (self.all_completed)
|
|
|
# pprint (self.all_failed)
|
|
|
# print ("\n\n***********\n\n")
|
|
|
# update any jobs that depended on the dependency
|
|
|
jobs = self.graph.pop(dep_id, [])
|
|
|
|
|
|
# recheck *all* jobs if
|
|
|
# a) we have HWM and an engine just become no longer full
|
|
|
# or b) dep_id was given as None
|
|
|
if dep_id is None or self.hwm and any( [ load==self.hwm-1 for load in self.loads ]):
|
|
|
jobs = self.depending.keys()
|
|
|
|
|
|
for msg_id in jobs:
|
|
|
raw_msg, targets, after, follow, timeout = self.depending[msg_id]
|
|
|
|
|
|
if after.unreachable(self.all_completed, self.all_failed) or follow.unreachable(self.all_completed, self.all_failed):
|
|
|
self.fail_unreachable(msg_id)
|
|
|
|
|
|
elif after.check(self.all_completed, self.all_failed): # time deps met, maybe run
|
|
|
if self.maybe_run(msg_id, raw_msg, targets, MET, follow, timeout):
|
|
|
|
|
|
self.depending.pop(msg_id)
|
|
|
for mid in follow.union(after):
|
|
|
if mid in self.graph:
|
|
|
self.graph[mid].remove(msg_id)
|
|
|
|
|
|
#----------------------------------------------------------------------
|
|
|
# methods to be overridden by subclasses
|
|
|
#----------------------------------------------------------------------
|
|
|
|
|
|
def add_job(self, idx):
|
|
|
"""Called after self.targets[idx] just got the job with header.
|
|
|
Override with subclasses. The default ordering is simple LRU.
|
|
|
The default loads are the number of outstanding jobs."""
|
|
|
self.loads[idx] += 1
|
|
|
for lis in (self.targets, self.loads):
|
|
|
lis.append(lis.pop(idx))
|
|
|
|
|
|
|
|
|
def finish_job(self, idx):
|
|
|
"""Called after self.targets[idx] just finished a job.
|
|
|
Override with subclasses."""
|
|
|
self.loads[idx] -= 1
|
|
|
|
|
|
|
|
|
|
|
|
def launch_scheduler(in_addr, out_addr, mon_addr, not_addr, config=None,logname='ZMQ',
|
|
|
log_addr=None, loglevel=logging.DEBUG, scheme='lru',
|
|
|
identity=b'task'):
|
|
|
from zmq.eventloop import ioloop
|
|
|
from zmq.eventloop.zmqstream import ZMQStream
|
|
|
|
|
|
if config:
|
|
|
# unwrap dict back into Config
|
|
|
config = Config(config)
|
|
|
|
|
|
ctx = zmq.Context()
|
|
|
loop = ioloop.IOLoop()
|
|
|
ins = ZMQStream(ctx.socket(zmq.XREP),loop)
|
|
|
ins.setsockopt(zmq.IDENTITY, identity)
|
|
|
ins.bind(in_addr)
|
|
|
|
|
|
outs = ZMQStream(ctx.socket(zmq.XREP),loop)
|
|
|
outs.setsockopt(zmq.IDENTITY, identity)
|
|
|
outs.bind(out_addr)
|
|
|
mons = ZMQStream(ctx.socket(zmq.PUB),loop)
|
|
|
mons.connect(mon_addr)
|
|
|
nots = ZMQStream(ctx.socket(zmq.SUB),loop)
|
|
|
nots.setsockopt(zmq.SUBSCRIBE, '')
|
|
|
nots.connect(not_addr)
|
|
|
|
|
|
scheme = globals().get(scheme, None)
|
|
|
# setup logging
|
|
|
if log_addr:
|
|
|
connect_logger(logname, ctx, log_addr, root="scheduler", loglevel=loglevel)
|
|
|
else:
|
|
|
local_logger(logname, loglevel)
|
|
|
|
|
|
scheduler = TaskScheduler(client_stream=ins, engine_stream=outs,
|
|
|
mon_stream=mons, notifier_stream=nots,
|
|
|
scheme=scheme, loop=loop, logname=logname,
|
|
|
config=config)
|
|
|
scheduler.start()
|
|
|
try:
|
|
|
loop.start()
|
|
|
except KeyboardInterrupt:
|
|
|
print ("interrupted, exiting...", file=sys.__stderr__)
|
|
|
|
|
|
|
