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https://issues.apache.org/jira/browse/HIVE-561?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zheng Shao updated HIVE-561:
----------------------------
Attachment: HIVE-561.1.patch
Added a configuration parameter:
{code}
<property>
<name>hive.map.aggr.hash.min.reduction</name>
<value>0.5</value>
<description>Hash aggregation will be turned off if the ratio between hash
table size and input rows is bigger than this number. Set to 1 to make sure
hash aggregation is never turned off.</description>
</property>
{code}
> Make Hash aggregation threshold configurable
> --------------------------------------------
>
> Key: HIVE-561
> URL: https://issues.apache.org/jira/browse/HIVE-561
> Project: Hadoop Hive
> Issue Type: Improvement
> Affects Versions: 0.3.0, 0.3.1
> Reporter: Zheng Shao
> Assignee: Zheng Shao
> Priority: Minor
> Fix For: 0.4.0
>
> Attachments: HIVE-561.1.patch
>
>
> Currently we stop doing Hash aggregation after seeing 100K rows and the
> reduction is below 50%. We should make it configurable.
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