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From rafaelweingartner <>
Subject [GitHub] cloudstack pull request: CID-1338387: paranoia null checking
Date Tue, 10 Nov 2015 13:14:00 GMT
Github user rafaelweingartner commented on the pull request:
    @DaanHoogland I agree with @miguelaferreira.
    I have looked that code.
    The select it runs is the following: 
    select from host h where h.status = 'Up' and h.hypervisor_type is not null  and h.data_center_id
= ? ORDER by rand() limit 1
    That makes me wondering, why ordering by random the projection?! That can make problems
harder to debug. Whatever, that is not the focus here.
    The only ways I see that select returning nothing are the following:
    •	If we have no hosts in the zone;
    •	If all of the hosts have hypervisor_type equal to null, is it even possible to have
a host with hypervisor_type = null?
    I would be concerned about the first case, a zone with no hosts. Thus, we should have
to check when the method “,
Command)” is called. 
    What API method ends up in that code, or what action of ACS is going execute it?

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