Miroslav Smiljanic created OAK-9180:
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             Summary: Optimise synchronisation between threads when writing to 
3rd level segment cache 
                 Key: OAK-9180
                 URL: https://issues.apache.org/jira/browse/OAK-9180
             Project: Jackrabbit Oak
          Issue Type: Improvement
            Reporter: Miroslav Smiljanic


Currently threads that are updating 3rd level segment cache, are obtaining lock 
 on the instance of HashMap, before inserting segmentId. 

This can be optimised by using Set, obtained from 
ConcurrentHashMap.newKeySet(). 



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