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From "Sergey Shelukhin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-14035) Enable predicate pushdown to delta files created by ACID Transactions
Date Thu, 04 Aug 2016 21:36:20 GMT

    [ https://issues.apache.org/jira/browse/HIVE-14035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15408527#comment-15408527
] 

Sergey Shelukhin commented on HIVE-14035:
-----------------------------------------

Some CR feedback on RB, mostly minor. Someone more familiar with ACID should review the core
logic, ideally. It makes sense to me.

> Enable predicate pushdown to delta files created by ACID Transactions
> ---------------------------------------------------------------------
>
>                 Key: HIVE-14035
>                 URL: https://issues.apache.org/jira/browse/HIVE-14035
>             Project: Hive
>          Issue Type: New Feature
>          Components: Transactions
>            Reporter: Saket Saurabh
>            Assignee: Saket Saurabh
>         Attachments: HIVE-14035.02.patch, HIVE-14035.03.patch, HIVE-14035.04.patch, HIVE-14035.05.patch,
HIVE-14035.06.patch, HIVE-14035.07.patch, HIVE-14035.08.patch, HIVE-14035.09.patch, HIVE-14035.10.patch,
HIVE-14035.11.patch, HIVE-14035.12.patch, HIVE-14035.patch
>
>
> In current Hive version, delta files created by ACID transactions do not allow predicate
pushdown if they contain any update/delete events. This is done to preserve correctness when
following a multi-version approach during event collapsing, where an update event overwrites
an existing insert event. 
> This JIRA proposes to split an update event into a combination of a delete event followed
by a new insert event, that can enable predicate push down to all delta files without breaking
correctness. To support backward compatibility for this feature, this JIRA also proposes to
add some sort of versioning to ACID that can allow different versions of ACID transactions
to co-exist together.



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