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https://issues.apache.org/jira/browse/MRESOLVER-7?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17693076#comment-17693076
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Knut Wannheden commented on MRESOLVER-7:
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Yes, the new parallel collector is working very nicely!
In one build I did see an error, which I was thinking might be related to using
the BF collector, but I haven't been able to reproduce it again. In my
settings.xml I have multiple Maven repositories configured which "overlap"
(i.e. some artifacts are contained in multiple of these repos) and I have never
been able to figure out how Maven decides from which repo to download an
artifact (yes, I know this is documented, but it doesn't appear to match my
observations). I don't know if this extra information is relevant or helpful,
but anyway, here is the error I saw. Please let me know if you want me to
create an issue.
{noformat}
[ERROR] Failed to execute goal
org.jacoco:jacoco-maven-plugin:0.8.8:prepare-agent (default-prepare-agent) on
project glu-test-contract-service-parent: Execution default-prepare-agent of
goal org.jacoco:jacoco-maven-plugin:0.8.8:prepare-agent failed: Plugin
org.jacoco:jacoco-maven-plugin:0.8.8 or one of its dependencies could not be
resolved: Failed to collect dependencies at
org.jacoco:jacoco-maven-plugin:jar:0.8.8 ->
org.apache.maven.shared:file-management:jar:1.2.1 ->
org.apache.maven:maven-plugin-api:jar:2.0.6: java.io.UncheckedIOException:
java.nio.file.AccessDeniedException:
c:\dev\.m2-nexus\repository\org\apache\maven\maven-parent\5\maven-parent-5.pom.lastUpdated.7796060141987260961.tmp
->
c:\dev\.m2-nexus\repository\org\apache\maven\maven-parent\5\maven-parent-5.pom.lastUpdated
-> [Help 1]{noformat}
> Download dependency POMs in parallel in BF collector
> ----------------------------------------------------
>
> 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
> Assignee: Tamas Cservenak
> Priority: Major
> Fix For: 1.9.0
>
> Attachments: resolve_deps.png, 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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