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

["Kristian Rosenvold (JIRA)" <ji...@codehaus.org>]

Multithreaded building can create bad files for downloaded artifacts in local repository
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                 Key: MNG-4706
                 URL: http://jira.codehaus.org/browse/MNG-4706
             Project: Maven 2 & 3
          Issue Type: Bug
          Components: Artifacts and Repositories
    Affects Versions: 3.0-beta-1
            Reporter: Kristian Rosenvold


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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