58 lines
1.9 KiB
Python
58 lines
1.9 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
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from manila.scheduler.filters import base_host
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LOG = log.getLogger(__name__)
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class IgnoreAttemptedHostsFilter(base_host.BaseHostFilter):
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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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'hosts': ['host1', 'host2'],
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'num_attempts': 3,
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}
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}
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"""
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def host_passes(self, host_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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hosts = attempted.get('hosts', [])
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host = host_state.host
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passes = host not in hosts
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pass_msg = "passes" if passes else "fails"
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LOG.debug("Host %(host)s %(pass_msg)s. Previously tried hosts: "
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"%(hosts)s", {'host': host,
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'pass_msg': pass_msg,
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'hosts': hosts})
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return passes
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