rakeshadr opened a new pull request #1437:
URL: https://github.com/apache/hadoop-ozone/pull/1437


   ## What changes were proposed in this pull request?
   
   With the new file system HDDS-2939 like semantics design it requires 
multiple DB lookups to traverse the path component in top-down fashion. This 
patch provides a metadata caching service to cache directories for faster 
lookup. This patch is developed as an independent module and needs to be 
integrated once HDDS-2949 is pushed in.
   
   ## What is the link to the Apache JIRA
   
   https://issues.apache.org/jira/browse/HDDS-2949
   
   ## How was this patch tested?
   
   Added unit test cases to verify cache init and other ops.
   


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