Daniel Dai created HIVE-15448:
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             Summary: ChangeManager for replication
                 Key: HIVE-15448
                 URL: https://issues.apache.org/jira/browse/HIVE-15448
             Project: Hive
          Issue Type: Sub-task
          Components: repl
            Reporter: Daniel Dai
            Assignee: Daniel Dai


The change manager implementation as described in 
https://cwiki.apache.org/confluence/display/Hive/HiveReplicationv2Development#HiveReplicationv2Development-Changemanagement.
 This issue tracks the infrastructure code. Hooking to actions will be tracked 
in other ticket.

ReplChangeManager includes:
* method to generate checksum
* method to convert file path to cm path
* method to move table/partition/file into cm
* thread to clear cm files if expires



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