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From koushik-das <...@git.apache.org>
Subject [GitHub] cloudstack issue #1640: CLOUDSTACK-9458: Fix HA bug when VMs are stopped on ...
Date Mon, 19 Sep 2016 05:57:31 GMT
Github user koushik-das commented on the issue:

    https://github.com/apache/cloudstack/pull/1640
  
    @abhinandanprateek In latest master the sequence of event described above only happens
when the host has been determined as 'Down'. Refer to the below code. So the bug described
won't happen. Earlier even when host state was 'Alert' the same sequence used to get triggered
which possibly killed healthy VMs.
    
    > if (host != null && host.getStatus() == Status.Down) {
    >     _haMgr.scheduleRestartForVmsOnHost(host, true);
    > }
    
    In case there is still a possibility of healthy VMs getting killed then the scenario needs
to be clearly identified. If we need to fix anything, the first thing would be look at improving
the VM investigators rather than changing the existing fencing logic.
    
    If we go ahead with the above fix then I can think of the following scenario that is broken.
In case of a genuine host down scenario non-HA VMs continue to remain in 'Running' state and
no operations can be done on it. Currently non-HA VMs are marked as 'Stopped' after fencing
is successful and they can be manually started on another host.


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