[jira] Commented: (CONTINUUM-1606) All modules are always rebuilt when using M2 with a hierarchical structure

["apache maillist (JIRA)" <ji...@codehaus.org>]

    [ http://jira.codehaus.org/browse/CONTINUUM-1606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=150818#action_150818 ] 

apache maillist commented on CONTINUUM-1606:
--------------------------------------------

it would be very nice if you could test the case below:
-- pom.xml - for continuum checking out 3 modules below
   -- parent module (parent pom for module1 and module2)
   -- module 1
   -- module 2

> All modules are always rebuilt when using M2 with a hierarchical structure
> --------------------------------------------------------------------------
>
>                 Key: CONTINUUM-1606
>                 URL: http://jira.codehaus.org/browse/CONTINUUM-1606
>             Project: Continuum
>          Issue Type: Bug
>          Components: Integration - Maven 2
>    Affects Versions: 1.1
>            Reporter: Julien S
>            Priority: Critical
>             Fix For: 1.x
>
>         Attachments: continuum-1.2.patch, CONTINUUM-1606.patch, continuum.patch
>
>
> When using Maven2, the recommended directory structure for a multi-module build is hierarchical, e.g.:
> - pom.xml (parent pom of all modules)
> --- module1
>   +-- pom.xml
> --- module2
>   +-- pom.xml
> etc
> When using such a structure with continuum, if a change is committed in module28, then EVERY module will be rebuilt: indeed the parent pom will be rebuilt because the change is "under" its scm tree, and all the other modules will therefore we rebuilt because of a "dependencies change" on the parent pom. This can easily multiply the build time by a factor of 10 or 20.
> I have attached a patch. It considers that the parent has "changed" only if its pom.xml has changed. Not sure it is perfect, but it works for me (the patch has been tested (against continuum-1.1 and trunk). Feel free to rewrite or modify it as much as you like.

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