DataDomain.lookupNode - use concurrent collection instead of synchronizing the 
HashMap
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                 Key: CAY-1680
                 URL: https://issues.apache.org/jira/browse/CAY-1680
             Project: Cayenne
          Issue Type: Improvement
          Components: Core Library
    Affects Versions: 3.1M3
            Reporter: Andrus Adamchik
            Assignee: Andrus Adamchik


We can improve performance by using a concurrent collection for 
DataDomain.lookupNode instead of synchronizing the HashMap.  Also instead of 
reindexing on failed lookups, we can simply lazy-fill collection from a given 
DataMap

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