[GitHub] nvazquez commented on issue #2466: Rare race condition in KVM migration

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nvazquez commented on issue #2466: Rare race condition in KVM migration
URL: https://github.com/apache/cloudstack/pull/2466#issuecomment-367991052
 
 
   Hi @rafaelweingartner, let me answer your questions by explaining the issue in a better way:
   
   This is issue is reported under these conditions:
   - VM migration has physically finished
   - Migration thread executor is still not marked as terminated
   
   From the migration monitoring process, as VM has been migrated, that domain cannot be found (we should get the destination domain from the migration thread later) and the LibvirtException is thrown: `LibvirtException ?Domain not found: no domain with matching uuid?`.
   So basically the idea is just logging the issue but not suspending the VM as the migration has already been performed, but the migration thread is not marked as finished. Once the migrarion thread is marked as finished, the migration monitoring process (while loop) ends and the migration command wrapper would continue its execution.
   Regarding your last question, we won't need to suspend the VM in this case as the migration has already been performed. VM suspension will take place whenever the migration is in progress and those conditions are met

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