Chen Liang created HDFS-12925:
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             Summary: Ozone: Container : Add key versioning support-2
                 Key: HDFS-12925
                 URL: https://issues.apache.org/jira/browse/HDFS-12925
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: ozone
    Affects Versions: HDFS-7240
            Reporter: Chen Liang
            Assignee: Chen Liang


One component for versioning is assembling read IO vector, (please see 4.2 
section of the versioning design doc HDFS-12000 for the detail). This JIRA adds 
the util functions that takes a list with blocks from different versions and 
properly generate the read vector for the requested version.



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