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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (MRESOLVER-7) Download dependency POMs in parallel
Date Sat, 07 Apr 2018 16:29:01 GMT


ASF GitHub Bot commented on MRESOLVER-7:

mikehearn commented on issue #10: [MRESOLVER-7] Download dependency POMs in parallel v2
   It looks like this has bit-rotted again. It'd be really nice to get this in.
   Some classes have moved into a sub-package in #12, so now package-private visibilities
are getting in the way. I wanted to try it out and see how much difference to speed it made,
so I just quickly undid #12. 
   For me it seems to roughly double the speed of artifact fetch. It'll probably make a much
bigger difference on higher latency links. Nice work!

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> Download dependency POMs in parallel
> ------------------------------------
>                 Key: MRESOLVER-7
>                 URL:
>             Project: Maven Resolver
>          Issue Type: Improvement
>    Affects Versions: Aether 1.0.2
>            Reporter: Harald Wellmann
>            Priority: Major
> 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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