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From "Attila Magyar (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-23282) Reduce number of DB calls in ObjectStore::getPartitionsByExprInternal
Date Mon, 27 Apr 2020 11:30:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-23282?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Attila Magyar updated HIVE-23282:
---------------------------------
    Status: Patch Available  (was: Open)

> Reduce number of DB calls in ObjectStore::getPartitionsByExprInternal
> ---------------------------------------------------------------------
>
>                 Key: HIVE-23282
>                 URL: https://issues.apache.org/jira/browse/HIVE-23282
>             Project: Hive
>          Issue Type: Improvement
>          Components: Metastore
>            Reporter: Rajesh Balamohan
>            Assignee: Attila Magyar
>            Priority: Major
>         Attachments: HIVE-23282.1.patch, HIVE-23282.2.patch, image-2020-04-23-14-07-06-077.png
>
>
> ObjectStore::getPartitionsByExprInternal internally uses Table information for getting
partitionKeys, table, catalog name.
>  
> For this, it ends up populating entire table data from DB (including skew column, parameters,
sort, bucket cols etc). This makes it a lot more expensive call. It would be good to check
if MTable itself can be used instead of Table.
> [https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/ObjectStore.java#L3327]
> [https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/ObjectStore.java#L3669]
>  
> !image-2020-04-23-14-07-06-077.png|width=665,height=592!



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