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From "Eugene Koifman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-18453) ACID: Add "CREATE TRANSACTIONAL TABLE" syntax to unify ACID ORC & Parquet support
Date Tue, 04 Sep 2018 19:53:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-18453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16603503#comment-16603503
] 

Eugene Koifman commented on HIVE-18453:
---------------------------------------

[~ikryvenko], no.  "create transactional..." should examine the create table statement and
create a full CRUD table if possible (i.e. if it's a managed table stored as ORC, not sorted,
etc.).  If this table cannot be made full CRUD, it should check if it can be made insert-only
transactional.  If that is not possible (e.g. the table is external), it should raise an
error.

 

This is exactly what happens when a "create table ..." (w/o any transactional=true property
in the create table stmt) is processed and both {{HiveConf.ConfVars.HIVE_CREATE_TABLES_AS_INSERT_ONLY}}
and {{MetastoreConf.ConfVars.CREATE_TABLES_AS_ACID}} are set to true.  That's why I'm suggesting
that you look at {{SemanticAnalyzer.validateAndAddDefaultProperties()}} - this is where the
logic to examine the new table is.  I think you can just make your "create transactional table..."
used this method.

> ACID: Add "CREATE TRANSACTIONAL TABLE" syntax to unify ACID ORC & Parquet support
> ---------------------------------------------------------------------------------
>
>                 Key: HIVE-18453
>                 URL: https://issues.apache.org/jira/browse/HIVE-18453
>             Project: Hive
>          Issue Type: Improvement
>          Components: Transactions
>            Reporter: Gopal V
>            Assignee: Igor Kryvenko
>            Priority: Major
>         Attachments: HIVE-18453.01.patch, HIVE-18453.02.patch, HIVE-18453.03.patch, HIVE-18453.04.patch,
HIVE-18453.05.patch, HIVE-18453.06.patch, HIVE-18453.07.patch
>
>
> The ACID table markers are currently done with TBLPROPERTIES which is inherently fragile.
> The "create transactional table" offers a way to standardize the syntax and allows for
future compatibility changes to support Parquet ACIDv2 tables along with ORC tables.
> The ACIDv2 design is format independent, with the ability to add new vectorized input
formats with no changes to the design.



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