elek opened a new pull request #700: HDDS-3172 Use DBStore instead of 
MetadataStore in SCM
URL: https://github.com/apache/hadoop-ozone/pull/700
 
 
   ## What changes were proposed in this pull request?
   
   Description
   
   The MetadataStore interface provides a generic view to any key / value store 
with a LevelDB and RocksDB implementation.
   
   Since the early version of MetadataStore we also go the DBStore interface 
which is more andvanced (it supports DB profiles and ColumnFamilies).
   
   To simplify the introduction of new features (like versioning or rocksdb 
tuning) we should use the new interface everywhere instead of the old interface.
   
   We should update SCM and Datanode to use the DBStore instead of 
MetadataStore.
   
   This patch is the first part of the cleanup it starts to use DBStore in SCM.
   
   ## What is the link to the Apache JIRA
   
   https://issues.apache.org/jira/browse/HDDS-3172
   
   ## How was this patch tested?
   
   Execution full integration test suite.

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