[jira] [Issue Comment Deleted] (HIVE-18193) Migrate existing ACID tables to use write id per table rather than global transaction id

["mahesh kumar behera (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-18193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

mahesh kumar behera updated HIVE-18193:
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    Comment: was deleted

(was: with Acid replication not yet supported, if we upgrade all tables to ACID, will it not disable replication for all tables ?)

> Migrate existing ACID tables to use write id per table rather than global transaction id
> ----------------------------------------------------------------------------------------
>
>                 Key: HIVE-18193
>                 URL: https://issues.apache.org/jira/browse/HIVE-18193
>             Project: Hive
>          Issue Type: Sub-task
>          Components: HiveServer2, Transactions
>    Affects Versions: 3.0.0
>            Reporter: anishek
>            Assignee: Sankar Hariappan
>            Priority: Blocker
>              Labels: ACID, Upgrade
>             Fix For: 3.0.0, 3.1.0
>
>         Attachments: HIVE-18193.01.patch, HIVE-18193.02.patch
>
>
> dependent upon HIVE-18192
> For existing ACID Tables we need to update the table level write id metatables/sequences so any new operations on these tables works seamlessly without any conflicting data in existing base/delta files.
> 1. Need to create metadata tables such as NEXT_WRITE_ID and TXN_TO_WRITE_ID.
> 2. Add entries for each ACID/MM tables into NEXT_WRITE_ID where NWI_NEXT is set to current value of NEXT_TXN_ID.NTXN_NEXT.
> 3. All current open/abort transactions to have an entry in TXN_TO_WRITE_ID such that T2W_TXNID=T2W_WRITEID=Open/AbortedTxnId.
> 4. Added new column TC_WRITEID in TXN_COMPONENTS and CTC_WRITEID in COMPLETED_TXN_COMPONENTS to store the write id which should be set as respective values of TC_TXNID and CTC_TXNID from the same row.



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