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Posted to dev@hive.apache.org by "Phabricator (JIRA)" <ji...@apache.org> on 2013/02/24 17:48:13 UTC
[jira] [Commented] (HIVE-4068) Size of aggregation buffer which
uses non-primitive type is not estimated correctly
[ https://issues.apache.org/jira/browse/HIVE-4068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13585414#comment-13585414 ]
Phabricator commented on HIVE-4068:
-----------------------------------
njain 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 Instead of checking instanceof, can you add a annotation ?
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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