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https://issues.apache.org/jira/browse/HIVE-23107?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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László Pintér updated HIVE-23107:
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Attachment: HIVE-23107.06.patch
> Remove MIN_HISTORY_LEVEL table
> ------------------------------
>
> Key: HIVE-23107
> URL: https://issues.apache.org/jira/browse/HIVE-23107
> Project: Hive
> Issue Type: Improvement
> Components: Hive
> Reporter: László Pintér
> Assignee: László Pintér
> Priority: Major
> Attachments: HIVE-23107.01.patch, HIVE-23107.02.patch,
> HIVE-23107.03.patch, HIVE-23107.04.patch, HIVE-23107.05.patch,
> HIVE-23107.06.patch
>
>
> MIN_HISTORY_LEVEL table is used in two places:
> * Cleaner uses it to decide if the files can be removed - this could be
> replaced by adding a new column to compaction_queue storing the next_txn_id
> when the change was committed, and before cleaning checking the minimum open
> transaction id in the TXNS table
> * Initiator uses it to decide if some items from TXN_TO_WRITE_ID table can
> be removed. This could be replaced by using the WRITE_SET.WS_COMMIT_ID.
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