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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4068) Size of aggregation buffer which uses non-primitive type is not estimated correctly
Date Sat, 27 Apr 2013 19:20:15 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13643768#comment-13643768
] 

Gopal V commented on HIVE-4068:
-------------------------------

Missed svn add of ql/src/java/org/apache/hadoop/hive/ql/util/JavaDataModel.java before check-in?




                
> 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
>             Fix For: 0.12.0
>
>         Attachments: HIVE-4068.D8859.1.patch, HIVE-4068.D8859.2.patch, HIVE-4068.D8859.3.patch,
HIVE-4068.D8859.4.patch, HIVE-4068.D8859.5.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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