[jira] [Commented] (HIVE-20531) Repl load on cloud storage file system can skip redundant move or add partition tasks.

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

    [ https://issues.apache.org/jira/browse/HIVE-20531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16632856#comment-16632856 ] 

Sankar Hariappan commented on HIVE-20531:
-----------------------------------------

05.patch committed to master.

Thanks [~maheshk114]!

> Repl load on cloud storage file system can skip redundant move or add partition tasks.
> --------------------------------------------------------------------------------------
>
>                 Key: HIVE-20531
>                 URL: https://issues.apache.org/jira/browse/HIVE-20531
>             Project: Hive
>          Issue Type: Sub-task
>          Components: repl
>    Affects Versions: 4.0.0
>            Reporter: mahesh kumar behera
>            Assignee: mahesh kumar behera
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 4.0.0
>
>         Attachments: HIVE-20531.01.patch, HIVE-20531.02.patch, HIVE-20531.03.patch, HIVE-20531.04.patch, HIVE-20531.05.patch
>
>
> In replication load, both add partition and insert operations are handled through import. Import creates 3 major tasks. Copy, add partition and move. Copy does the copy of data from source location to staging directory. Then add partition (which runs in parallel to copy) creates the partition in meta store. Its a no op in case of insert and by the time this ddl task is executed for insert partition would be already present. The third operation is move. Which actually moves the file from staging directory to actual location. And then in case of insert it adds the insert event to notification table. It does this for add partition operation which is redundant as the event for add partition would have been written already by ddl task. With the optimization to copy directly to actual table location in S3, move task can be avoided for add partition operation replay and replay of insert need not create the add partition (ddl) task.



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