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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-8704) Schedule restart of router VMs ahead of user VMs as part of HA
Date Mon, 10 Aug 2015 05:05:45 GMT


ASF GitHub Bot commented on CLOUDSTACK-8704:

Github user koushik-das commented on the pull request:
    @remibergsma Thanks for testing the PR. This is a best-effort fix. The change just schedules
the restart of the system VMs ahead of the user VMs. Now if there are fewer VMs for restart,
there is a higher probability of all restart jobs getting executed at the same time by the
HA-worker thread pool. In this case the fix won't be effective. If there are more VMs then
the effectiveness of the fix increases.

> Schedule restart of router VMs ahead of user VMs as part of HA
> --------------------------------------------------------------
>                 Key: CLOUDSTACK-8704
>                 URL:
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Management Server
>    Affects Versions: 4.5.0
>            Reporter: Koushik Das
>            Assignee: Koushik Das
>             Fix For: 4.6.0
> When a host is detected as Down, HA-enabled VMs running on it are scheduled for restart.
There may be scenarios where both user VM and corresponding VR is on the same host and scheduled
for restart. In such cases user VM restart will fail in initial attempts until VR is restarted.
One way to reduce these occurrences is to schedule VR restart ahead of user VMs. 

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