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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4068) Size of aggregation buffer which uses non-primitive type is not estimated correctly
Date Sun, 28 Apr 2013 17:06:16 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13644059#comment-13644059
] 

Hudson commented on HIVE-4068:
------------------------------

Integrated in Hive-trunk-h0.21 #2083 (See [https://builds.apache.org/job/Hive-trunk-h0.21/2083/])
    HIVE-4437 Missing file on HIVE-4068 (Navis) (Revision 1476701)

     Result = ABORTED
navis : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1476701
Files : 
* /hive/trunk/ql/src/java/org/apache/hadoop/hive/ql/util/JavaDataModel.java

                
> 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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