[jira] [Commented] (MRESOLVER-7) Download dependency POMs in parallel

["Ivan Babiankou (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MRESOLVER-7?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17466473#comment-17466473 ] 

Ivan Babiankou commented on MRESOLVER-7:
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I opened [a PR|https://github.com/apache/maven-resolver/pull/142] to implement this change. Unit and integration tests pass, however there seems to be a race condition (see stack trace [^resolver.log] ) that is hard to reproduce.

> Download dependency POMs in parallel
> ------------------------------------
>
>                 Key: MRESOLVER-7
>                 URL: https://issues.apache.org/jira/browse/MRESOLVER-7
>             Project: Maven Resolver
>          Issue Type: Improvement
>          Components: Resolver
>    Affects Versions: Aether 1.0.2
>            Reporter: Harald Wellmann
>            Priority: Major
>         Attachments: resolver.log
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> h3. Background
> When building a project with dependencies not yet available in the local repository, I noticed that Maven 3.3.9/Aether 1.0.2 first downloads the dependency POMs _sequentially_ and then proceeds downloading the dependency JARs with up to 5 threads _in parallel_.
> Due to this, when first building a project with a large number of dependencies, downloading a large number of small POMs may take a lot longer than downloading the much larger JARs, or even longer than building the project itself, especially when a repository manager is used which increases the download latency.
> h3. Enhancement
> Download POMs of (transitive) dependencies in parallel to significantly speed up initial builds of large projects.



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