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From "Eugene Koifman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-18192) Introduce WriteID per table rather than using global transaction ID
Date Thu, 22 Feb 2018 23:57:04 GMT

    [ https://issues.apache.org/jira/browse/HIVE-18192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16373704#comment-16373704
] 

Eugene Koifman commented on HIVE-18192:
---------------------------------------

I added a couple of nits on pull request for patch 16 - can be done in a followup.

+1 for patch 16 pending tests

> 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
>            Priority: Major
>              Labels: ACID, DR, pull-request-available
>             Fix For: 3.0.0
>
>         Attachments: HIVE-18192.01.patch, HIVE-18192.02.patch, HIVE-18192.03.patch, HIVE-18192.04.patch,
HIVE-18192.05.patch, HIVE-18192.06.patch, HIVE-18192.07.patch, HIVE-18192.08.patch, HIVE-18192.09.patch,
HIVE-18192.10.patch, HIVE-18192.11.patch, HIVE-18192.12.patch, HIVE-18192.13.patch, HIVE-18192.14.patch,
HIVE-18192.15.patch, HIVE-18192.16.patch
>
>
> 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 
>  <original write id, bucketid, rowid>
> For each table modified by the given transaction will have a table level write ID allocated
and a persisted map of global txn id -> to table -> write id for that table has to
be maintained to allow Snapshot isolation.
> Readers should use the combination of ValidTxnList and ValidWriteIdList(Table) for snapshot
isolation.
>  
>  [Hive Replication - ACID Tables.pdf|https://issues.apache.org/jira/secure/attachment/12903157/Hive%20Replication-%20ACID%20Tables.pdf]
has a section "Per Table Sequences (Write-Id)" with more detials



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