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https://issues.apache.org/jira/browse/HIVE-18193?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sankar Hariappan updated HIVE-18193:
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Status: Open (was: Patch Available)
> 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
>
>
> 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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