Chen Liang created HDFS-12989:
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             Summary: Ozone: Container : Add key versioning support-4
                 Key: HDFS-12989
                 URL: https://issues.apache.org/jira/browse/HDFS-12989
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: ozone
            Reporter: Chen Liang
            Assignee: Chen Liang


After HDFS-12925 and HDFS-12954 get added, every key write call will generate a 
new version, and we will be able to read any specific version of a key. This 
JIRA adds a new newKeyReader API {{newKeyReaderWithVersion}} to 
{{StorageHandler}}. This method takes an extra version field such that the 
caller can read any older version. This JIRA also adds all the other changes 
needed. 



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