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From "Julien S (JIRA)" <j...@codehaus.org>
Subject [jira] Created: (CONTINUUM-1606) All modules are always rebuilt when using M2 with a hierarchical structure
Date Tue, 18 Dec 2007 09:35:58 GMT
All modules are always rebuilt when using M2 with a hierarchical structure
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                 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
         Attachments: 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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