Maven hangs with big aggregators with lots of inter-modules dependencies
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Key: MNG-4740
URL: http://jira.codehaus.org/browse/MNG-4740
Project: Maven 2 & 3
Issue Type: Bug
Components: Bootstrap & Build
Affects Versions: 3.0-beta-1
Reporter: Vincent Latombe
Attachments: hangs.patch
Hello,
On my main aggregator (~280 modules, lots of inter-modules dependencies), I
noticed that since 3.0-beta-1, maven hangs after displaying the list of modules
to build. The problem was not occurring with alpha-7.
After investigation, it seems that with the introduction of parallel build in
beta-1, the whole list of module dependencies is computed at the beginning of
the build (see
http://svn.apache.org/viewvc/maven/maven-3/trunk/maven-core/src/main/java/org/apache/maven/lifecycle/internal/ProjectSegment.java?r1=931884&r2=935334&diff_format=h)
It turns out that this calculation, done inside DefaultProjectDependencyGraph,
is very unefficient : if a module is referenced n times, its dependencies will
be computed n times. The attached patch solves the problem by computing the
dependency tree for a given projectId only once.
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