You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@hive.apache.org by "Sankar Hariappan (JIRA)" <ji...@apache.org> on 2018/01/22 16:31:00 UTC
[jira] [Comment Edited] (HIVE-18192) Introduce WriteID per table
rather than using global transaction ID
[ https://issues.apache.org/jira/browse/HIVE-18192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16334311#comment-16334311 ]
Sankar Hariappan edited comment on HIVE-18192 at 1/22/18 4:30 PM:
------------------------------------------------------------------
Added 05.patch after reverting field name in ROW__ID struct from "writeid" to "transactionid" to fix several test failures.
Also, used lowercase for DB and table names stored in txn meta tables.
was (Author: sankarh):
Added 05.patch after reverting field name in ROW__ID struct from "writeid" to "transactionid" to fix several test failures.
> 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
>
>
> 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
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)