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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-17196) CM: ReplCopyTask should retain the original file names even if copied from CM path.
Date Mon, 11 Sep 2017 22:20:00 GMT

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

Daniel Dai updated HIVE-17196:
------------------------------
    Attachment: HIVE-17196.1.patch

> 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: Daniel Dai
>             Fix For: 3.0.0
>
>         Attachments: HIVE-17196.1.patch
>
>
> 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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