[jira] [Commented] (HIVE-21487) COMPLETED_COMPACTIONS and COMPACTION_QUEUE table missing appropriate indexes

["Laszlo Pinter (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-21487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17019560#comment-17019560 ] 

Laszlo Pinter commented on HIVE-21487:
--------------------------------------

We should add the following indexes to compaction related tables:



COMPACTION_QUEUE: cq_id and (cq_state, cq_id)

COMPLETED_COMPACTIONS: (cc_database, cc_table, cc_partition)

> 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
>
> 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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