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https://issues.apache.org/jira/browse/HIVE-22725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17014922#comment-17014922
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Rajesh Balamohan commented on HIVE-22725:
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Added guava's supplier::memoize in patch .2.
> Lazy evaluate HiveMetastore::fireReadTablePreEvent table computation
> --------------------------------------------------------------------
>
> Key: HIVE-22725
> URL: https://issues.apache.org/jira/browse/HIVE-22725
> Project: Hive
> Issue Type: Improvement
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Priority: Minor
> Attachments: HIVE-22725.1.patch, HIVE-22725.2.patch,
> image-2020-01-14-13-22-54-483.png
>
>
> "TransactionalValidationListener" gets added in the pre-event listeners of
> HMS by default.
> [https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HiveMetaStore.java#L559]
> This causes issue in short select queries, as table details are computed for
> any partition lookups.
> [https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HiveMetaStore.java#L4984]
>
> !image-2020-01-14-13-22-54-483.png|width=579,height=202!
>
> It would be good to lazy evaluate table lookup in this codepath.
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