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https://issues.apache.org/jira/browse/MRESOLVER-123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17170909#comment-17170909
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Rainer Reich commented on MRESOLVER-123:
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Hi Michael. Sorry, been on vacation. I would also say most of the commenters
didn't understand the problem at all - but it's closed, so I don't think I'm
gonna start a new "discussion" there now. Thanks for fighting!
I'm a little bit confused about the state of this, though: Your change is in
1.5.0, right? This ticket is closed, but the PR isn't "merged" but only
"closed". How is that?
And what vote has been cancelled? One for a new Maven Release (resolver
obviously has been released)? Will the next Maven Release use 1.5.0 of
maven-resolver or will the stick to an older version?
> Provide a global locking sync context by default
> ------------------------------------------------
>
> Key: MRESOLVER-123
> URL: https://issues.apache.org/jira/browse/MRESOLVER-123
> Project: Maven Resolver
> Issue Type: New Feature
> Components: resolver
> Affects Versions: 1.4.2
> Reporter: Michael Osipov
> Assignee: Michael Osipov
> Priority: Critical
> Fix For: 1.5.0
>
> Attachments: checksum-error-debug.log, mvn-debug-1.4.3-123.txt.gz
>
>
> This is an umbrella ticket for a long standing issue with Maven Resolver: Our
> concurrency support is mediocre in a way that if two or more threads try to
> download the same file and fail to queue those write actions nicely. The
> problem is that The {{SyncContext}} and the its factory provided by Maven
> Resolver does not employ any locking at all. As layed out in detail in
> MRESOLVER-114 we need striped read write locks on artifacts and its metadata.
> This issue shall track progress on it. Even Takari Concurrent Repository
> extension does not help because it is only intended to synchronize concurrent
> access by multple JVMs and not threads.
> This improvement will provide solely a global locking sync context which will
> work in *single* JVM. It is a non-goal to make it work with mulitple JVMs. A
> downside of this solution is that is coarse, possible degregation of
> performance for the sake of stability.
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