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https://issues.apache.org/jira/browse/HIVE-11566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei Zheng resolved HIVE-11566.
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Resolution: Duplicate
HIVE-11587 contains this improvement.
> Hybrid grace hash join should only allocate write buffer for a hash partition
> when first write happens
> ------------------------------------------------------------------------------------------------------
>
> Key: HIVE-11566
> URL: https://issues.apache.org/jira/browse/HIVE-11566
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 1.2.0
> Reporter: Wei Zheng
> Assignee: Wei Zheng
>
> Currently it's allocating one write buffer for a number of hash partitions up
> front, which can cause GC pause.
> It's better to do the write buffer allocation on demand.
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