Sheng Yang created CLOUDSTACK-6047:
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Summary: Make Virtual Router to aggregate execution of commands
Key: CLOUDSTACK-6047
URL: https://issues.apache.org/jira/browse/CLOUDSTACK-6047
Project: CloudStack
Issue Type: Improvement
Security Level: Public (Anyone can view this level - this is the default.)
Components: Network Controller, Virtual Router
Reporter: Sheng Yang
Assignee: Sheng Yang
Priority: Blocker
Fix For: 4.4.0
Currently VR has an scalability issue during the large deployment. Everytime
when VR need to be re-create or reboot, CloudStack would send lots of
programming commands to it. VR would treat them as individual commands then
execute them. In large deployment, it would take tens of minutes or even hours
to complete all the necessary updates, like setup DHCP and programming firewall.
For example, in the past, everytime we setup DHCP in VR, we need to restart
dnsmasq service for every programming, which is very time consuming. Though
we've introduced a way to reload without restart dnsmasq, but the same issue
existed with apache2 and other services as well. And every SSH to VR would also
time consuming.
The new approach of reprogramming VR, would help greatly on this issue, and
hopefully great reduce the VR programming time. It would introduce a mechanism
to "aggregate" the commands to be executed, and do it in one batch inside VR.
And restart the related services(if necesary) only after the whole batch is
completed. The configuration would be transfer to VR in one piece as well,
eliminate any unnecessary ssh.
We would expect in such scenario, most configuration would only be text update
and involve no more time consuming operations. We would leave every possible
time consuming operation to the end of execution of aggregated commands.
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