Sergey Shelukhin commented on HIVE-19124:

Fixing initiator to not skip MM tables, addressing most of the other feedback.
Also making sure that compactor doesn't commit a new txn that writes to the 
table, instead just like a regular compactor it commits by moving the directory 
into place.

One thing that is not addressed is the parallel writer case, which is the same 
issue as HIVE-18570.

Let me see if I can address it for compaction specifically...

> implement a basic major compactor for MM tables
> -----------------------------------------------
>                 Key: HIVE-19124
>                 URL: https://issues.apache.org/jira/browse/HIVE-19124
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>            Priority: Major
>              Labels: mm-gap-2
>         Attachments: HIVE-19014.01.patch, HIVE-19124.patch
> For now, it will run a query directly and only major compactions will be 
> supported.

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