[
https://issues.apache.org/jira/browse/HIVE-28853?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Krisztian Kasa resolved HIVE-28853.
-----------------------------------
Fix Version/s: 4.1.0
Resolution: Fixed
Merged to master. Thanks [~seonggon] for the patch and [~sbadhya] for the
review.
> SharedWorkOptimizer does not consider MapJoin operators' InMemoryDataSize in
> certain code paths.
> ------------------------------------------------------------------------------------------------
>
> Key: HIVE-28853
> URL: https://issues.apache.org/jira/browse/HIVE-28853
> Project: Hive
> Issue Type: Bug
> Reporter: Seonggon Namgung
> Assignee: Seonggon Namgung
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.1.0
>
>
> To prevent excessive MapJoin HashTable usage, SharedWorkOptimizer checks the
> total InMemoryDataSize, including both merged and unmerged MapJoins that
> belong to the same vertex, before proceeding to merge step. However, the
> current implementation skips this check when merging only a pair of TS or a
> pair of TS-FIL. This omission can lead to performance degradation due to
> loading large HashTables.
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
