Nitin Mehta created CLOUDSTACK-3305:
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Summary: TemplateSync Deletes the templates in creation state from
Seconday storage.
Key: CLOUDSTACK-3305
URL: https://issues.apache.org/jira/browse/CLOUDSTACK-3305
Project: CloudStack
Issue Type: Bug
Security Level: Public (Anyone can view this level - this is the default.)
Affects Versions: 4.2.0
Reporter: Nitin Mehta
Fix For: 4.2.0
this is what is happening.
1. Template creation from snapshot triggered. Work going on, but there is no
update in DB that there is Work in Progress (//TODO Fix this Long term by
putting an intermediate state)
2. Work gets complete and the agent returns back. We dont update the DB and
send a computechecksum command to SSVM. (//TODO Long term - The create template
itself should return the checksum - fix needed at ssvm for vmware and at
citrix/libvrt resourcebase for XS and KVM)
3. Template sync gets triggered (because of unhealthy ssvm connecting back and
forth with MS) and reports this template to the MS being on secondary storage,
but we have no record that WIP in DB. So template sync deletes the template on
SS. (//TODO short term - Should we be aggressive to delete the template or just
sending an alert is fine ? Or if we can just relax and maybe delete in the next
run or do more checking ?)
4. Compute checksum returns and DB is updated that a template is created and
put into Ready status, but underlying it go deleted.
For now I have changed the compute checksum logic after updating the DB that
template is created. See the commit above for more information. BUT, this
doesnt completely eliminate the race condition. There would still be a window
where before updating the DB sync mechanism deletes the template (I think this
should happen rarely),
I can also make the fix possible in #3 (//TODO short term - Should we be
aggressive to delete the template or just sending an alert is fine)
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