96 lines
3.4 KiB
Python
Executable File
96 lines
3.4 KiB
Python
Executable File
# TODO
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# 1. send an email to an email address defined by env['admin-email']
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# if resources are finished
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# 2. Introduce a status endpoint of the scheduler -
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# maybe expose a prometheus compatible output
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from ucloud.common.request import RequestEntry, RequestType
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from ucloud.shared import shared
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from ucloud.settings import settings
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from .helper import (
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get_suitable_host,
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dead_host_mitigation,
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dead_host_detection,
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assign_host,
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NoSuitableHostFound,
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)
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from . import logger
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def main():
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pending_vms = []
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for request_iterator in [
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shared.etcd_client.get_prefix(
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settings["etcd"]["request_prefix"], value_in_json=True
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),
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shared.etcd_client.watch_prefix(
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settings["etcd"]["request_prefix"],
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timeout=5,
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value_in_json=True,
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),
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]:
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for request_event in request_iterator:
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request_entry = RequestEntry(request_event)
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# Never Run time critical mechanism inside timeout
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# mechanism because timeout mechanism only comes
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# when no other event is happening. It means under
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# heavy load there would not be a timeout event.
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if request_entry.type == "TIMEOUT":
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# Detect hosts that are dead and set their status
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# to "DEAD", and their VMs' status to "KILLED"
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dead_hosts = dead_host_detection()
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if dead_hosts:
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logger.debug("Dead hosts: %s", dead_hosts)
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dead_host_mitigation(dead_hosts)
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# If there are VMs that weren't assigned a host
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# because there wasn't a host available which
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# meets requirement of that VM then we would
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# create a new ScheduleVM request for that VM
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# on our behalf.
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while pending_vms:
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pending_vm_entry = pending_vms.pop()
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r = RequestEntry.from_scratch(
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type="ScheduleVM",
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uuid=pending_vm_entry.uuid,
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hostname=pending_vm_entry.hostname,
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request_prefix=settings["etcd"][
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"request_prefix"
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],
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)
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shared.request_pool.put(r)
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elif request_entry.type == RequestType.ScheduleVM:
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logger.debug(
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"%s, %s", request_entry.key, request_entry.value
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)
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vm_entry = shared.vm_pool.get(request_entry.uuid)
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if vm_entry is None:
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logger.info(
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"Trying to act on {} but it is deleted".format(
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request_entry.uuid
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)
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)
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continue
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shared.etcd_client.client.delete(
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request_entry.key
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) # consume Request
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try:
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assign_host(vm_entry)
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except NoSuitableHostFound:
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vm_entry.add_log(
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"Can't schedule VM. No Resource Left."
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)
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shared.vm_pool.put(vm_entry)
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pending_vms.append(vm_entry)
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logger.info("No Resource Left. Emailing admin....")
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if __name__ == "__main__":
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main()
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