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Posted to issues@maven.apache.org by "John Casey (JIRA)" <ji...@codehaus.org> on 2008/03/06 15:54:29 UTC
[jira] Commented: (MNG-3379) Parallel resolution of artifacts
[ http://jira.codehaus.org/browse/MNG-3379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_126329 ]
John Casey commented on MNG-3379:
---------------------------------
do we need to be concerned at all with file-locking in the repository with this? We have an issue open for concurrent writes into the local repo, MNG-2802, but I expect this to be more about concurrent Maven processes running on the same machine, rather than concurrent retrieval of artifacts within one process. This is mainly because the resolution process will probably not cause the type of file overlap that could cause problems, though in the case of metadata I can see how it might...
> Parallel resolution of artifacts
> --------------------------------
>
> Key: MNG-3379
> URL: http://jira.codehaus.org/browse/MNG-3379
> 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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