[jira] [Commented] (HIVE-23282) Reduce number of DB calls in ObjectStore::getPartitionsByExprInternal

["Ashutosh Chauhan (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-23282?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17092568#comment-17092568 ] 

Ashutosh Chauhan commented on HIVE-23282:
-----------------------------------------

getPartitionsByExprInternal() doesn't need Table object at all. it can run(false) It only needs tbl name, db name and cat name which are already present. No need to fetch full Table object.

> 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
>            Priority: Major
>         Attachments: 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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