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From "Sheng Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CLOUDSTACK-4856) Optimize on the # of control commands sent by MS to HV host
Date Tue, 19 Nov 2013 17:23:21 GMT

    [ https://issues.apache.org/jira/browse/CLOUDSTACK-4856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13826700#comment-13826700
] 

Sheng Yang commented on CLOUDSTACK-4856:
----------------------------------------

A pair of RvR would be distributed on different hosts, and only update one host at time would
likely cause chaos in consistency of RvR status.

E.g. The switch over happen, and the first host contained old BACKUP which already switch
to the MASTER. Then the update status of the host would return MASTER.

At this time, we haven't updated host of the old MASTER yet, so we don't know if the states
of RvR are both up to date. And we would see two MASTER in the network as the result.

That's the reason why we always update one pair of RvR(not individually one of them), which
we can know after update complete, we would know the latest status of RvR in the network.
This make things more simple.

> Optimize on the # of control commands sent by MS to HV host
> -----------------------------------------------------------
>
>                 Key: CLOUDSTACK-4856
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-4856
>             Project: CloudStack
>          Issue Type: Bug
>      Security Level: Public(Anyone can view this level - this is the default.) 
>          Components: Management Server
>    Affects Versions: pre-4.0.0, 4.1.0, 4.2.0
>            Reporter: Koushik Das
>             Fix For: 4.3.0
>
>
> This is a placeholder bug for all control commands whose count can be minimized by doing
some optimisation.
> 1. CheckRouterCommand
> This is used for checking status of redundant VR and is send for each router at regular
intervals. Instead of sending individual commands to each VR, these can be batched for all
routers residing on the same host.
> This is a general idea and can be extended to other such commands as well.



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