abh1sar commented on PR #12847:
URL: https://github.com/apache/cloudstack/pull/12847#issuecomment-5596650765

   All of @Damans227 comments are valid.
   
   Most important is takeBackup using up all of the 5 worker threads present on 
each kvm host.
   Operations like Start/Stop/Reboot/Migrate didn't use to wait for in-sequence 
commands like TakeBackup.
   But now someone can start 5 long running TakeBackup commands on a host. 
Until they finish Start/Stop/Reboot/Migrate operations will be stuck.
   We need a concurrency cap for TakeBackup commands per kvm host. 
   Maybe TakeBackup can take 2 or 3 slots per host, but using all 5 slots at a 
time is not a good idea.


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