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https://issues.apache.org/jira/browse/MNG-5965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16064431#comment-16064431
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Janos Gyerik commented on MNG-5965:
-----------------------------------
Although {{sonar:sonar}} is mentioned here, it's not required for the
reproducer, and it has nothing to do with the issue here. You can reproduce for
example with {{mvn clean install:install-file -Dfile=path/to/jar -T10}}, and
get an output as below. Notice the duplicate steps.
{code}
[INFO] Scanning for projects...
[INFO]
[INFO] Using the MultiThreadedBuilder implementation with a thread count of 10
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Example Project 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:3.0.0:clean (default-clean) @ my-project ---
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Example Project 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:3.0.0:clean (default-clean) @ my-project ---
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Example Project 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-install-plugin:2.5.2:install-file (default-cli) @ my-project
---
[INFO] Installing /path/to/jar to /path/to/maven/repo
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building Example Project 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-install-plugin:2.5.2:install-file (default-cli) @ my-project
---
[INFO] Installing /path/to/jar to /path/to/maven/repo
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.638 s (Wall Clock)
[INFO] Finished at: 2017-06-27T09:55:48+02:00
[INFO] Final Memory: 11M/240M
[INFO] ------------------------------------------------------------------------
{code}
> Parallel build multiplies work if multiple goals are given
> ----------------------------------------------------------
>
> Key: MNG-5965
> URL: https://issues.apache.org/jira/browse/MNG-5965
> Project: Maven
> Issue Type: Bug
> Components: Bootstrap & Build
> Affects Versions: 3.3.9
> Environment: Windows 7 64bit
> Reporter: Matthias Schmalz
> Attachments: parallel.test.zip
>
>
> When I run a parallel build which invokes multiple goals Maven multiplies the
> work e.g. when I run
> install sonar:sonar
> Every phase is executed once as expected. However when I run
> install sonar:sonar -T 4
> Every phase is executed twice.
> The problem can be reproduced with a single simple Java project (of course
> parallel builds are useless with a single module). Debugging showed that
> every Mojo is really called twice per project.
> Find attached a simple project and two build outputs, where you can see that
> the parallel build is doing everything twice (you can ignore that Sonar fails
> in the end, due to no server is up).
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