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From "Eugene Koifman (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-16669) Fine tune Compaction to take advantage of Acid 2.0
Date Wed, 28 Jul 2021 14:14:03 GMT

     [ https://issues.apache.org/jira/browse/HIVE-16669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eugene Koifman reassigned HIVE-16669:
-------------------------------------

    Assignee:     (was: Eugene Koifman)

> Fine tune Compaction to take advantage of Acid 2.0
> --------------------------------------------------
>
>                 Key: HIVE-16669
>                 URL: https://issues.apache.org/jira/browse/HIVE-16669
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>            Reporter: Eugene Koifman
>            Priority: Critical
>         Attachments: HIVE-16669.wip.patch
>
>
> * There is little point using 2.0 vectorized reader since there is no operator pipeline
in compaction
> * If minor compaction just concats delete_delta files together, then the 2 stage compaction
should always ensure that we have a limited number of Orc readers to do the merging and current
OrcRawRecordMerger should be fine
> * ...



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