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OpenStack Study: ignore_attempted_hosts_filter.py

OpenStack Index

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# Copyright (c) 2011 OpenStack Foundation.

# All Rights Reserved.

# Licensed under the Apache License, Version 2.0 (the "License"); you may

# not use this file except in compliance with the License. You may obtain

# a copy of the License at

# http://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT

# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the

# License for the specific language governing permissions and limitations

# under the License.

from cinder.openstack.common.gettextutils import _ # noqa

from cinder.openstack.common import log as logging

from cinder.openstack.common.scheduler import filters

LOG = logging.getLogger(__name__)

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class IgnoreAttemptedHostsFilter(filters.BaseHostFilter):

"""Filter out previously attempted hosts

A host passes this filter if it has not already been attempted for

scheduling. The scheduler needs to add previously attempted hosts

to the 'retry' key of filter_properties in order for this to work

correctly. For example:

'hosts': ['host1', 'host2'],

'num_attempts': 3,

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def host_passes(self, host_state, filter_properties):

"""Skip nodes that have already been attempted."""

attempted = filter_properties.get('retry', None)

if not attempted:

# Re-scheduling is disabled

LOG.debug(_("Re-scheduling is disabled."))

hosts = attempted.get('hosts', [])

host = host_state.host

passes = host not in hosts

pass_msg = "passes" if passes else "fails"

LOG.debug(_("Host %(host)s %(pass_msg)s. Previously tried hosts: "

"%(hosts)s") % {'host': host,

'pass_msg': pass_msg,

'hosts': hosts})