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https://issues.apache.org/jira/browse/HIVE-4068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13585546#comment-13585546
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Phabricator commented on HIVE-4068:
-----------------------------------
navis has commented on the revision "HIVE-4068 [jira] Size of aggregation
buffer which uses non-primitive type is not estimated correctly".
INLINE COMMENTS
ql/src/java/org/apache/hadoop/hive/ql/exec/GroupByOperator.java:581 We still
need a method for estimation and I thought it's better to have a interface for
that. You mean annotation + interface or annotation + reflection on convention?
For "annotation + interface" case, it seemed a little redundant. User should
specify the annotation and implement new interface also. For "annotation +
reflection", it' not safe and need a little more codes.
REVISION DETAIL
https://reviews.facebook.net/D8859
To: JIRA, navis
Cc: njain
> Size of aggregation buffer which uses non-primitive type is not estimated
> correctly
> -----------------------------------------------------------------------------------
>
> Key: HIVE-4068
> URL: https://issues.apache.org/jira/browse/HIVE-4068
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Navis
> Assignee: Navis
> Priority: Minor
> Attachments: HIVE-4068.D8859.1.patch, HIVE-4068.D8859.2.patch
>
>
> Currently, hive assumes an aggregation buffer which holds a map is occupying
> just 256 byte (fixed). If it's bigger than that in real, OutOfMemoryError can
> be thrown (especially for >1k buffer).
> workaround : set hive.map.aggr.hash.percentmemory=<smaller value than
> default(0.5)>
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