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https://issues.apache.org/jira/browse/IVY-1465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13983159#comment-13983159
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Shikhar Bhushan commented on IVY-1465:
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It's been hard to setup an isolated test for it - it always comes up in our
multi-module build with inter-module dependencies, though. We also have an
internal Archiva maven repository. Not sure if these factors play any part.
Anyway some good/bad news: I managed to reproduce the issue without this patch
on Ivy trunk. The 2.4-RC1 was fine. I am going to try and bisect for the
regression.
> ModuleRules.getRule is O(n) leading to resolution slowness
> ----------------------------------------------------------
>
> Key: IVY-1465
> URL: https://issues.apache.org/jira/browse/IVY-1465
> Project: Ivy
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.3.0
> Environment: OpenJDK 6,7, MacOSX + Ubuntu
> Reporter: Joshua Suereth
> Priority: Minor
> Labels: performance
>
> So, for the sbt project we noticed significant resolution time improvements
> with the following patch:
> https://github.com/sbt/ivy/pull/1
> The reasoning:
> A lot of artifacts being resolved use Maven's "dependencyManagement"
> conventions
> Ivy appears to turn these into "exact matcher" rules
> A ton of resolution time is spent filtering through these rules
> The existing solution is O(n) for all overrides
> What the patch does:
> Creates a key'd store for all "exact matcher" rules
> When executing rules, ensure that we only traverse what we have to
> (non-exact, exact specific to our key and "default").
> As I said, this represents a significant speed bump for sbt builds using Ivy.
> All existing tests pass, and I think they cover this aspect of ivy pretty
> well, from what I could see.
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