Sergey Shelukhin updated HIVE-17970:
    Attachment: HIVE-17970.02.patch

> MM LOAD DATA with OVERWRITE doesn't use base_n directory concept
> ----------------------------------------------------------------
>                 Key: HIVE-17970
>                 URL: https://issues.apache.org/jira/browse/HIVE-17970
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Transactions
>    Affects Versions: 3.0.0
>            Reporter: Eugene Koifman
>            Assignee: Sergey Shelukhin
>            Priority: Major
>              Labels: mm-gap-2
>         Attachments: HIVE-17970.01.patch, HIVE-17970.02.patch, 
> HIVE-17970.patch
> Judging by 
> {code:java}
> Hive.loadTable(Path loadPath, String tableName, LoadFileType loadFileType, 
> boolean isSrcLocal,
>       boolean isSkewedStoreAsSubdir, boolean isAcid, boolean 
> hasFollowingStatsTask,
>       Long txnId, int stmtId, boolean isMmTable)
> {code}
> LOAD DATA with OVERWRITE will delete all existing data then write new data 
> into the table.  This logic makes sense for non-acid tables but for Acid/MM 
> it should work like INSERT OVERWRITE statement and write new data to base_n/. 
> This way the lock manager can be used to either get an X lock for IOW and 
> thus block all readers or let it run with SemiShared and let readers continue 
> and make the system more concurrent.

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