@Override
    public void setHostState(final HostName hostName, final HostStatus status) {
        if (probe) return;
        hostInfosCache.setHostStatus(reference, hostName, status);
    }
ZooKeeper implementation of {@link ApplicationLock}.

@author hakonhall
orchestrator/src/main/java/com/yahoo/vespa/orchestrator/status/ZkApplicationLock.java