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https://issues.apache.org/jira/browse/HIVE-20908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16887468#comment-16887468
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Ashutosh Chauhan commented on HIVE-20908:
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I dont see how this patch will improve perf, if anything it might make it
worse. You are still making a call per DB, so nothing changes there but now
instead of passing name you are passing pattern, so you will get more table
objects then necessary.
Suggestion on HIVE-19432 was to create a pattern on dbNames and then make a
*single* metastoreClient.getTableMeta() to get all table objects in one shot,
instead of per DB.
> Avoid multiple getTableMeta calls during GetTablesOperation.
> ------------------------------------------------------------
>
> Key: HIVE-20908
> URL: https://issues.apache.org/jira/browse/HIVE-20908
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 3.1.1
> Reporter: Rajkumar Singh
> Assignee: Rajkumar Singh
> Priority: Minor
> Labels: performance
> Attachments: HIVE-20908.patch
>
>
> following HIVE-19432, we are doing getTableMeta for each authorized db
> instead of that we can pass pattern for metastore.
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