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https://issues.apache.org/jira/browse/MRESOLVER-123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17148492#comment-17148492
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Michael Osipov commented on MRESOLVER-123:
------------------------------------------
Please provide the following output from your Nexus work dir:
{noformat}
root@deblndw011x:/var/nexus2
# less
./storage/central/.nexus/attributes/org/apache/maven/maven-parent/31/maven-parent-31.pom
{"storageItem-readable":"true","storageItem-expired":"false","storageItem-modified":"1563442700000","storageItem-repositoryId":"central","storageItem-lastRequested":"1593508869556","storageItem-storedLocally":"1591912466498","remote.sha1":"e773af8e851de63461222f3a26d37e4619431e03","request.address":"158.226.192.214","storageItem-writable":"true","digest.md5":"236ee4e050fb10734caac73935b2e1f4","storageItem-created":"1563442700000","request.user":"osipovmi","storageItem-path":"/org/apache/maven/maven-parent/31/maven-parent-31.pom","storageItem-remoteUrl":"https://maven-central-eu.storage-download.googleapis.com/maven2/org/apache/maven/maven-parent/31/maven-parent-31.pom","request.isConfidential":"true","storageItem-checkedRemotely":"1593508869590","storageItem-generation":"9","digest.sha1":"e773af8e851de63461222f3a26d37e4619431e03","proxyRepository-invalidationToken":"2375351505934972"}
{noformat}
Please also enable HttpClient wire log:
{noformat}
org.slf4j.simpleLogger.log.org.apache.maven.wagon.providers.http.httpclient=debug
org.slf4j.simpleLogger.log.org.apache.maven.wagon.providers.http.httpclient.wire=debug
{noformat}
> 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
>
>
> 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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