59 lines
2.1 KiB
Python
59 lines
2.1 KiB
Python
# Copyright (c) 2011 OpenStack Foundation.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from oslo_log import log as logging
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from cinder.scheduler import filters
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LOG = logging.getLogger(__name__)
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class IgnoreAttemptedHostsFilter(filters.BaseBackendFilter):
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"""Filter out previously attempted hosts
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A host passes this filter if it has not already been attempted for
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scheduling. The scheduler needs to add previously attempted hosts
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to the 'retry' key of filter_properties in order for this to work
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correctly. For example::
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{
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'retry': {
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'backends': ['backend1', 'backend2'],
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'num_attempts': 3,
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}
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}
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"""
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def backend_passes(self, backend_state, filter_properties):
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"""Skip nodes that have already been attempted."""
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attempted = filter_properties.get('retry')
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if not attempted:
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# Re-scheduling is disabled
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LOG.debug("Re-scheduling is disabled.")
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return True
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# TODO(geguileo): In P - Just use backends
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backends = attempted.get('backends', attempted.get('hosts', []))
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backend = backend_state.backend_id
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passes = backend not in backends
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pass_msg = "passes" if passes else "fails"
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LOG.debug("Backend %(backend)s %(pass_msg)s. Previously tried "
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"backends: %(backends)s", {'backend': backend,
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'pass_msg': pass_msg,
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'backends': backends})
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return passes
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