[jira] [Comment Edited] (HIVE-18192) Introduce WriteID per table rather than using global transaction ID

["Eugene Koifman (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-18192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16299027#comment-16299027 ] 

Eugene Koifman edited comment on HIVE-18192 at 12/20/17 8:41 PM:
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[~anishek] will share the doc that includes explanation of write ids.  Snapshot Isolation will of course be preserved.


was (Author: ekoifman):
I'll try to share the doc by end of the week.  Snapshot Isolation will of course be preserved.

> Introduce WriteID per table rather than using global transaction ID
> -------------------------------------------------------------------
>
>                 Key: HIVE-18192
>                 URL: https://issues.apache.org/jira/browse/HIVE-18192
>             Project: Hive
>          Issue Type: Sub-task
>          Components: HiveServer2, Transactions
>    Affects Versions: 3.0.0
>            Reporter: anishek
>            Assignee: Sankar Hariappan
>              Labels: ACID, DR
>             Fix For: 3.0.0
>
>
> To support ACID replication, we will be introducing a per table write Id which will replace the transaction id in the primary key for each row in a ACID table. 
> The current primary key is determined via 
> <original transaction id, bucketid , rowid>
> which will move to 
> <write id, bucketid, rowid>
> a persistable map of global txn id -> to table -> write id for that table has to be maintained to now allow Snapshot isolation.



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