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https://issues.apache.org/jira/browse/HIVE-17970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16268072#comment-16268072
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Sergey Shelukhin commented on HIVE-17970:
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cc [~hagleitn] [~steveyeom2017] another MM gap (which I guess was expected),
followup from HIVE-17856
> 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
> Labels: mm-gap-2
>
> 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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