[jira] [Work started] (HIVE-17196) CM: ReplCopyTask should retain the original file names even if copied from CM path.

["Sankar Hariappan (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-17196?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-17196 started by Sankar Hariappan.
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> CM: ReplCopyTask should retain the original file names even if copied from CM path.
> -----------------------------------------------------------------------------------
>
>                 Key: HIVE-17196
>                 URL: https://issues.apache.org/jira/browse/HIVE-17196
>             Project: Hive
>          Issue Type: Sub-task
>          Components: repl
>    Affects Versions: 2.1.0
>            Reporter: Sankar Hariappan
>            Assignee: Sankar Hariappan
>             Fix For: 3.0.0
>
>
> Consider the below scenario,
> 1. Insert into table T1 with value(X).
> 2. Insert into table T1 with value(X).
> 3. Truncate the table T1. 
> – This step backs up 2 files with same content to cmroot which ends up with one file in cmroot as checksum matches.
> 4. Incremental repl with above 3 operations.
> – In this step, both the insert event files will be read from cmroot where copy of one leads to overwrite the other one as the file name is same in cm path (checksum as file name).
> So, this leads to data loss and hence it is necessary to retain the original file names even if we copy from cm path.



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