Maven
  1. Maven
  2. MNG-4740

Maven hangs with big aggregators with lots of inter-modules dependencies

    Details

    • Type: Bug Bug
    • Status: Closed Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 3.0-beta-1
    • Fix Version/s: 3.0-beta-2
    • Component/s: Bootstrap & Build
    • Labels:
      None
    • Complexity:
      Intermediate
    • Patch Submitted:
      Yes
    • Number of attachments :
      1

      Description

      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.

      1. hangs.patch
        1 kB
        Vincent Latombe

        Activity

        Hide
        Benjamin Bentmann added a comment -

        Applied in r979808, thanks!

        Show
        Benjamin Bentmann added a comment - Applied in r979808 , thanks!

          People

          • Assignee:
            Benjamin Bentmann
            Reporter:
            Vincent Latombe
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            Dates

            • Created:
              Updated:
              Resolved: