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Posted to dev@hive.apache.org by "Phabricator (JIRA)" <ji...@apache.org> on 2013/02/24 08:26:13 UTC
[jira] [Updated] (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:all-tabpanel ]
Phabricator updated HIVE-4068:
------------------------------
Attachment: HIVE-4068.D8859.1.patch
navis requested code review of "HIVE-4068 [jira] Size of aggregation buffer which uses non-primitive type is not estimated correctly".
Reviewers: JIRA
HIVE-4068 Size of aggregation buffer which uses non-primitive type is not estimated correctly
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)>
TEST PLAN
EMPTY
REVISION DETAIL
https://reviews.facebook.net/D8859
AFFECTED FILES
ql/src/java/org/apache/hadoop/hive/ql/exec/GroupByOperator.java
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDAFEvaluator.java
MANAGE HERALD RULES
https://reviews.facebook.net/herald/view/differential/
WHY DID I GET THIS EMAIL?
https://reviews.facebook.net/herald/transcript/21519/
To: JIRA, navis
> 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
>
>
> 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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