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From "Don Brown (JIRA)" <>
Subject [jira] Commented: (MNG-3379) Parallel resolution of artifacts
Date Mon, 04 Feb 2008 03:45:58 GMT


Don Brown commented on MNG-3379:

* are RuntimeExceptions appropriate? Seems more like they should be normal artifact resolution
failures and the list of missing artifacts stuck together

* may need a different progress monitor since this shows no progress any more (one that can
be done in parallel also is great)
Yeah, this is the last biggish chunk of work still to do.  The progress bar just goes crazy

* I'd like to investigate controlling this by settings (pool size)
Makes sense, but in my testing, it didn't see to help much after 5, but that could just be
due to my particular multi-core box.

> Parallel resolution of artifacts
> --------------------------------
>                 Key: MNG-3379
>                 URL:
>             Project: Maven 2
>          Issue Type: New Feature
>          Components: Artifacts and Repositories
>    Affects Versions: 2.0.8
>            Reporter: Don Brown
>            Assignee: Brett Porter
>         Attachments: parallel-resolution-2.diff, parallel-resolution-3.diff, parallel-resolution.diff
> Artifacts should be resolved in parallel, grouped by group id's to get around the lack
of synchronization in the local repository.  The patch does the following:
> * Use a ThreadPoolExecutor to parallelize artifact resolution, but takes care not to
resolve multiple artifacts from the same group id simultaneously. (requires Java 5)
> * Makes the http wagon the default instead of the poor performing http-client
> Disadvantages: 
> * Requires Java 5, but the backport jars could be substituted pretty easily
> * Breaks some plugins due to commons-logging being in the Maven uber jar (required by
commons-httpclient), notably the apt plugin (maybe more should use the isolatedRealm setting?)
> * Screws up the progress monitor as multiple threads are updating it
> Advantages:
> * Much faster when combined with the http wagon (WAGON-98).  I was seeing 40% improvement
on some test builds.

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