[jira] [Created] (MNG-6418) Parallel builds with empty local repository hang

["Stefan Mueller (JIRA)" <ji...@apache.org>]

Stefan Mueller created MNG-6418:
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             Summary: Parallel builds with empty local repository hang
                 Key: MNG-6418
                 URL: https://issues.apache.org/jira/browse/MNG-6418
             Project: Maven
          Issue Type: Bug
    Affects Versions: 3.5.2
         Environment: Build on Windows or Linux (happens on both environments)
Java 1.8.0_161
Company central Maven repo is Nexus Repository Manager
            Reporter: Stefan Mueller
         Attachments: maven-3.5.2-hang-dump.txt

Parallel builds of multi-module Projects using multiple threads (like mvn -T 5 clean install) usually run fine if most or all dependencies already exist in the local Maven repository.

If the local Maven repository is *empty*, such builds will sporadically hang. The hang seems at random points but always related to downloading artifacts from a central repo.

Using Maven *3.2.5* there are no such issues!

Parallel builds with an empty repository are especially important for the CI builds on Jenkins, as Jenkins uses a fresh new job-local repository for each build. This leads to most Jenkins build hang after upgrading from Maven 3.2.5 to 3.5.2.

See the attached thread-dump while hanging (seems to be related to org.eclipse.aether.connector.basic.PartialFile$LockFile)

 



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