[jira] [Assigned] (MNG-4706) Multithreaded building can create bad files for downloaded artifacts in local repository

["Sylwester Lachiewicz (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MNG-4706?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sylwester Lachiewicz reassigned MNG-4706:
-----------------------------------------

    Assignee:     (was: Kristian Rosenvold)

> Multithreaded building can create bad files for downloaded artifacts in local repository
> ----------------------------------------------------------------------------------------
>
>                 Key: MNG-4706
>                 URL: https://issues.apache.org/jira/browse/MNG-4706
>             Project: Maven
>          Issue Type: Bug
>          Components: Artifacts and Repositories
>    Affects Versions: 3.0-beta-1
>            Reporter: Kristian Rosenvold
>            Priority: Major
>             Fix For: 3.x / Backlog
>
>
> Within a parallel build, modules A and B can start at the same time and decide at the same time that they need to download artifact X. Since X is not available locally, both can start download of X. Both will download X and both will try to write the file for X to disk.
> On Windows platforms, one of them can fail with file locking problems. On Unixes the contents of the written file can be non-deterministic.
> This issue is related to MNG-2802 in the sense that it can create a corrupted artifact file in the local repository, and it can happen to ANY file written. But as opposed to MNG-2802 the synhronization needed to fix this issue is basically only within a single running maven process, so regular java mechanisms can apply, whereas MNG-2802 probably needs to use a totally different solution space.



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