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https://issues.apache.org/jira/browse/MRESOLVER-123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17150878#comment-17150878
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Rainer Reich commented on MRESOLVER-123:
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Added the log: [^successful-sha1-log.txt]
The 1000 runs were executed over weeks / months of regular CI executions using
our patched Maven everywhere.
I don't know how fast we could deploy a patch with your version, because of our
Nexus-checksum-problem... But I could cherry-pick your fix onto 1.4.1 and
create a patched Maven for our CI, or is there some other important change we'd
be missing then?
> Concurrency issues
> ------------------
>
> Key: MRESOLVER-123
> URL: https://issues.apache.org/jira/browse/MRESOLVER-123
> Project: Maven Resolver
> Issue Type: Bug
> Components: resolver
> Affects Versions: 1.4.2
> Reporter: Michael Osipov
> Priority: Critical
> Attachments: checksum-error-debug.log, successful-sha1-log.txt
>
>
> 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.
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