Github user koushik-das commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/656#discussion_r36168376
  
    --- Diff: server/src/com/cloud/ha/HighAvailabilityManagerImpl.java ---
    @@ -261,25 +264,21 @@ public void scheduleRestartForVmsOnHost(final HostVO 
host, boolean investigate)
             // send an email alert that the host is down, include VMs
             HostPodVO podVO = _podDao.findById(host.getPodId());
             String hostDesc = "name: " + host.getName() + " (id:" + 
host.getId() + "), availability zone: " + dcVO.getName() + ", pod: " + 
podVO.getName();
    +        _alertMgr.sendAlert(AlertManager.AlertType.ALERT_TYPE_HOST, 
host.getDataCenterId(), host.getPodId(), "Host is down, " + hostDesc,
    +                "Host [" + hostDesc + "] is down." + ((sb != null) ? 
sb.toString() : ""));
     
    -        _alertMgr.sendAlert(AlertManager.AlertType.ALERT_TYPE_HOST, 
host.getDataCenterId(), host.getPodId(), "Host is down, " + hostDesc, "Host [" 
+ hostDesc +
    -            "] is down." +
    -            ((sb != null) ? sb.toString() : ""));
    -
    -        if (vms != null) {
    -            for (VMInstanceVO vm : vms) {
    -                if (s_logger.isDebugEnabled()) {
    -                    s_logger.debug("Notifying HA Mgr of to restart vm " + 
vm.getId() + "-" + vm.getInstanceName());
    -                }
    -                vm = _instanceDao.findByUuid(vm.getUuid());
    -                Long hostId = vm.getHostId();
    -                if (hostId != null && !hostId.equals(host.getId())) {
    -                    s_logger.debug("VM " + vm.getInstanceName() + " is not 
on down host " + host.getId() + " it is on other host "
    -                            + hostId + " VM HA is done");
    -                    continue;
    -                }
    -                scheduleRestart(vm, investigate);
    +        for (VMInstanceVO vm : reorderedVMList) {
    +            if (s_logger.isDebugEnabled()) {
    +                s_logger.debug("Notifying HA Mgr of to restart vm " + 
vm.getId() + "-" + vm.getInstanceName());
    +            }
    +            vm = _instanceDao.findByUuid(vm.getUuid());
    +            Long hostId = vm.getHostId();
    +            if (hostId != null && !hostId.equals(host.getId())) {
    --- End diff --
    
    @DaanHoogland The host check you are referring to existed even before this 
PR. One reason for the check is to ensure that the VM has not moved to another 
host since the time it was fetched using listByHostId(). If it has moved to 
another host (and vmsync has updated the host id) then no need to perform 
restart/HA.


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