openstack/charm-heat
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This commit is contained in:
Billy Olsen 2015-06-11 09:32:09 -07:00
commit 138ffc23d5
1 changed files with 12 additions and 2 deletions
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14
hooks/charmhelpers/contrib/hahelpers/cluster.py
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@ -44,6 +44,7 @@ from charmhelpers.core.hookenv import (
ERROR,
WARNING,
unit_get,
is_leader as juju_is_leader
)
from charmhelpers.core.decorators import (
retry_on_exception,
@ -68,12 +69,21 @@ def is_elected_leader(resource):
Returns True if the charm executing this is the elected cluster leader.
It relies on two mechanisms to determine leadership:
1. If the charm is part of a corosync cluster, call corosync to
1. If juju is sufficiently new and leadership election is supported,
the is_leader command will be used.
2. If the charm is part of a corosync cluster, call corosync to
determine leadership.
2. If the charm is not part of a corosync cluster, the leader is
3. If the charm is not part of a corosync cluster, the leader is
determined as being "the alive unit with the lowest unit numer". In
other words, the oldest surviving unit.
"""
try:
return juju_is_leader()
except NotImplementedError:
log('Juju leadership election feature not enabled'
', using fallback support',
level=WARNING)
if is_clustered():
if not is_crm_leader(resource):
log('Deferring action to CRM leader.', level=INFO)