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https://issues.apache.org/jira/browse/MRESOLVER-123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17148707#comment-17148707
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Michael Osipov commented on MRESOLVER-123:
------------------------------------------

I already can resolve the issue with the checksum failure. The exception 
constructor says:
{noformat}
    /**
     * Creates a new exception with the specified expected and actual checksum. 
The resulting exception is
     * {@link #isRetryWorthy() retry-worthy}.
     * 
     * @param expected The expected checksum as declared by the hosting 
repository, may be {@code null}.
     * @param actual The actual checksum as computed from the local bytes, may 
be {@code null}.
     */
    public ChecksumFailureException( String expected, String actual )
{noformat}

So the response from Nexus is the canonical value and our locale is the actual 
one. No fix necessary here.

> 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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