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()