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http://jira.codehaus.org/browse/MNG-4343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=190125#action_190125
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Igor Fedorenko commented on MNG-4343:
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Forgot to mention, the solution should improve performance over maven jvm
restarts, i.e. m2e should not need to access all remote repositories for
missing artifacts after restart.
I believe local repository needs to cache per-repository artifact availability
status to solve this properly. Implementation will likely need to use update
policy to missing artifacts periodically. Meaning of "-U" cli parameter will
likely need to include missing release artifacts, too.
> maven always checks missing release artifacts
> ---------------------------------------------
>
> Key: MNG-4343
> URL: http://jira.codehaus.org/browse/MNG-4343
> Project: Maven 2
> Issue Type: Bug
> Components: Artifacts and Repositories
> Affects Versions: 3.0
> Reporter: Igor Fedorenko
>
> As I tried to explain in MARTIFACT-25, maven always checks for missing
> release artifacts and even though this does not have noticeable performance
> impact on regular maven cli builds (unless, -fn, I guess), this does cause
> significant performance problems in embedding applications like m2e in some
> scenarios.
> To demonstrate the problem, I've added new (and currently disable)
> testResolveMissingArtifact to P001EmbedderTest performance regression test
> suite. On my development machine, running
> doTestResolveMissingArtifact(delay=false) takes ~2ms on average. Running
> doTestResolveMissingArtifact(delay=true), on the other hand, takes ~202ms,
> which means that remote repository is accessed twice during each
> doTestResolveMissingArtifact(delay=true) call.
> https://svn.sonatype.org/m2eclipse/sandbox/trunk/maven-performance-tests/src/test/java/org/apache/maven/performance/tests/p001/P001EmbedderTest.java
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