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https://issues.apache.org/jira/browse/HIVE-18659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16361463#comment-16361463
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Eugene Koifman commented on HIVE-18659:
---------------------------------------

_orc_acid_version is not written consistently. in fact is't only there from 
streaming ingest use case.
Also, it's written into the partition dir, which can have base/deltas written 
by different versions of hive.
I agree it's cheaper but putting into the file itself is more reliable 
especially since people tend to try to move acid files around.

> add acid version marker to acid files
> -------------------------------------
>
>                 Key: HIVE-18659
>                 URL: https://issues.apache.org/jira/browse/HIVE-18659
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>            Reporter: Eugene Koifman
>            Assignee: Eugene Koifman
>            Priority: Major
>         Attachments: HIVE-18659.01.patch
>
>
> add acid version marker to acid files so that we know which version of acid 
> wrote the file



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