48 lines
1.4 KiB
Python
48 lines
1.4 KiB
Python
from __future__ import absolute_import
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import logging
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from lock_manager import Lock, LockError
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from lock_manager.decorators import simple_locking
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from .models import Node, JobQueue
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from .exceptions import JobQueueNoPendingJobs
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LOCK_EXPIRE = 10
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# TODO: Tie LOCK_EXPIRATION with hard task timeout
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MAX_CPU_LOAD = 90
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MAX_MEMORY_USAGE = 90
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logger = logging.getLogger(__name__)
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@simple_locking('refresh_node', 10)
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def refresh_node():
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logger.debug('starting')
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node = Node.objects.myself() # Automatically calls the refresh() method too
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def job_queue_poll():
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logger.debug('starting')
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node = Node.objects.myself() # Automatically calls the refresh() method too
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if node.cpuload < MAX_CPU_LOAD and node.memory_usage < MAX_MEMORY_USAGE:
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# Poll job queues is node is not overloaded
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lock_id = u'job_queue_poll'
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try:
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lock = Lock.acquire_lock(lock_id, LOCK_EXPIRE)
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except LockError:
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pass
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except Exception:
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lock.release()
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raise
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else:
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for job_queue in JobQueue.objects.all():
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try:
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job_item = job_queue.get_oldest_pending_job()
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job_item.run()
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except JobQueueNoPendingJobs:
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logger.debug('no pending jobs for job queue: %s' % job_queue)
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lock.release()
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