[jira] Updated: (CONTINUUM-2514) Prepare Build Queue slow down parallel built start

["Maria Catherine Tan (JIRA)" <ji...@codehaus.org>]

     [ https://jira.codehaus.org/browse/CONTINUUM-2514?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Maria Catherine Tan updated CONTINUUM-2514:
-------------------------------------------

    Fix Version/s:     (was: 1.4.1 (Beta))
                   1.4.2 (Beta)

> Prepare Build Queue slow down parallel built start
> --------------------------------------------------
>
>                 Key: CONTINUUM-2514
>                 URL: https://jira.codehaus.org/browse/CONTINUUM-2514
>             Project: Continuum
>          Issue Type: Bug
>          Components: Parallel Builds
>    Affects Versions: 1.3.6
>            Reporter: Philippe Busque
>             Fix For: 1.4.2 (Beta)
>
>
> When a scheduler or a build group trigger a series of compilation, every projects are enqueued in the Prepare Build Queue.  This queue doesn't consider the project group of a project when iterating through it.
> As a result, newly added project, but independent,  can wait a long time before being launched in a different built queue, as it has to wait for every entries from the previous groups to be processed.  
> To speed up the launch of parallel builts, the Prepare Build Queue should alternate between Project Group when more than 1 group is present.
> Example:  
> Set up 4 parallel built queues.
> Put 100 projects in Group A.
> Put 2 projects in Group B.
> Launch the built of Group A. All jobs are inserted in the Prepare Build Queue.
> Launch the built of Group B.  The 2 jobs are inserted in the Prepare Build Queue.
> Since the projects of group B are independent to Group A, they should be added to the Built Queue immediately. However, they will only be added once the 100 projects from Group A has been analyzed.
> In our case, we have 6 queues and 40 groups.  The average busy queue for the first half hour of compile is 4 queues as the prepare queue doesn't push new projects fast enough to fill the queues.

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