cstamas opened a new pull request, #303:
URL: https://github.com/apache/maven-resolver/pull/303

   This class currently gives away same names for artifact and metadata locks, 
that causes MRESOLVER-373 where artifact and metadata resolver together attempt 
illegal "lock upgrade", as both operate on same named lock.
   
   This is wrong, as all other name mappers distinguish among them, also in 
case of snapshots, there are cases when shared lock is enough for artifact but 
metadata MAY need refresh, hence exclusive.
   
   ---
   
   https://issues.apache.org/jira/browse/MRESOLVER-373


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