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https://issues.apache.org/jira/browse/HIVE-21487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17026641#comment-17026641
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Laszlo Pinter commented on HIVE-21487:
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I created a couple of performance tests using the HMS benchmarking tool, and I
noticed a slight performance improvement on Initiator side with new indexes on
COMPLETED_COMPACTIONS: (cc_database, cc_table, cc_partition).
[~pvary] [~dkuzmenko] [~klcopp] Could you please review? Thanks
> COMPLETED_COMPACTIONS and COMPACTION_QUEUE table missing appropriate indexes
> ----------------------------------------------------------------------------
>
> Key: HIVE-21487
> URL: https://issues.apache.org/jira/browse/HIVE-21487
> Project: Hive
> Issue Type: Bug
> Affects Versions: 3.1.1
> Reporter: Todd Lipcon
> Assignee: Laszlo Pinter
> Priority: Major
> Attachments: HIVE-21847.01.patch, HIVE-21847.02.patch
>
>
> Looking at a MySQL install where HMS is pointed on Hive 3.1, I see a constant
> stream of queries of the form:
> {code}
> select CC_STATE from COMPLETED_COMPACTIONS where CC_DATABASE =
> 'tpcds_orc_exact_1000' and CC_TABLE = 'catalog_returns' and CC_PARTITION =
> 'cr_returned_date_sk=2452851' and CC_STATE != 'a' order by CC_ID desc;
> {code}
> but the COMPLETED_COMPACTIONS table has no index. In this case it's resulting
> in a full table scan over 115k rows, which takes around 100ms.
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