def is_cluster_leader():
self_id = Compute.get_instance_id()
cluster = Compute.get_install_id()
instances = Compute.get_all_instances()
leader = JBoxDynConfig.get_cluster_leader(cluster)
img_recentness = Compute.get_image_recentness()
JBoxDB.log_debug("cluster: %s. instances: %s. leader: %s. image recentness: %d",
cluster, repr(instances), repr(leader), img_recentness)
# if none set, or set instance is dead elect self as leader, but wait till next cycle to prevent conflicts
if (leader is None) or (leader not in instances) and (img_recentness >= 0):
JBoxDB.log_info("setting self (%s) as cluster leader", self_id)
try:
JBoxDynConfig.set_cluster_leader(cluster, self_id)
except:
JBoxDB.log_info("error setting self (%s) as cluster leader, will retry", self_id)
return False
is_leader = (leader == self_id)
# if running an older ami, step down from cluster leader
if (img_recentness < 0) and is_leader:
JBoxDB.log_info("unmarking self (%s) as cluster leader", self_id)
JBoxDynConfig.unset_cluster_leader(cluster)
return False
return is_leader
def is_cluster_leader():
self_id = Compute.get_instance_id()
cluster = Compute.get_install_id()
instances = Compute.get_all_instances()
leader = JBoxDynConfig.get_cluster_leader(cluster)
img_recentness = Compute.get_image_recentness()
JBoxDB.log_debug(
"cluster: %s. instances: %s. leader: %s. image recentness: %d",
cluster, repr(instances), repr(leader), img_recentness)
# if none set, or set instance is dead elect self as leader, but wait till next cycle to prevent conflicts
if (leader is None) or (leader not in instances) and (img_recentness >= 0):
JBoxDB.log_info("setting self (%s) as cluster leader", self_id)
try:
JBoxDynConfig.set_cluster_leader(cluster, self_id)
except:
JBoxDB.log_info(
"error setting self (%s) as cluster leader, will retry",
self_id)
return False
is_leader = (leader == self_id)
# if running an older ami, step down from cluster leader
if (img_recentness < 0) and is_leader:
JBoxDB.log_info("unmarking self (%s) as cluster leader", self_id)
JBoxDynConfig.unset_cluster_leader(cluster)
return False
return is_leader
def publish_stats():
JBoxUserV2.calc_stats()
JBoxDynConfig.set_stat(Compute.get_install_id(), JBoxUserV2.STAT_NAME, JBoxUserV2.STATS)
def is_proposed_cluster_leader():
cluster = Compute.get_install_id()
leader = JBoxDynConfig.get_cluster_leader(cluster)
return leader == Compute.get_instance_id()
def publish_stats():
JBoxUserV2.calc_stats()
JBoxDynConfig.set_stat(Compute.get_install_id(), JBoxUserV2.STAT_NAME,
JBoxUserV2.STATS)
def is_proposed_cluster_leader():
cluster = Compute.get_install_id()
leader = JBoxDynConfig.get_cluster_leader(cluster)
return leader == Compute.get_instance_id()
