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Posted to dev@hive.apache.org by "Namit Jain (JIRA)" <ji...@apache.org> on 2010/01/28 01:16:34 UTC
[jira] Created: (HIVE-1115) optimize combinehiveinputformat in
presence of many partitions
optimize combinehiveinputformat in presence of many partitions
--------------------------------------------------------------
Key: HIVE-1115
URL: https://issues.apache.org/jira/browse/HIVE-1115
Project: Hadoop Hive
Issue Type: Improvement
Components: Query Processor
Reporter: Namit Jain
A query like :
select .. from T where ...
where T contains a very large number of partitions does not work very well with CombineHiveInputFomat.
A pool is created per directory, which leads to a high number of mappers.
In case all partitions share the same operator tree, and the same partition description, only a single pool should be created.
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[jira] Commented: (HIVE-1115) optimize combinehiveinputformat in
presence of many partitions
Posted by "Paul Yang (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HIVE-1115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861514#action_12861514 ]
Paul Yang commented on HIVE-1115:
---------------------------------
Not quite sure if this will be completed this quarter - I believe MAPREDUCE-1501 was helpful in handling a similar use case?
> optimize combinehiveinputformat in presence of many partitions
> --------------------------------------------------------------
>
> Key: HIVE-1115
> URL: https://issues.apache.org/jira/browse/HIVE-1115
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Paul Yang
>
> A query like :
> select .. from T where ...
> where T contains a very large number of partitions does not work very well with CombineHiveInputFomat.
> A pool is created per directory, which leads to a high number of mappers.
> In case all partitions share the same operator tree, and the same partition description, only a single pool should be created.
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You can reply to this email to add a comment to the issue online.
[jira] Assigned: (HIVE-1115) optimize combinehiveinputformat in
presence of many partitions
Posted by "Namit Jain (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HIVE-1115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Namit Jain reassigned HIVE-1115:
--------------------------------
Assignee: Paul Yang (was: Namit Jain)
> optimize combinehiveinputformat in presence of many partitions
> --------------------------------------------------------------
>
> Key: HIVE-1115
> URL: https://issues.apache.org/jira/browse/HIVE-1115
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Paul Yang
>
> A query like :
> select .. from T where ...
> where T contains a very large number of partitions does not work very well with CombineHiveInputFomat.
> A pool is created per directory, which leads to a high number of mappers.
> In case all partitions share the same operator tree, and the same partition description, only a single pool should be created.
--
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You can reply to this email to add a comment to the issue online.
[jira] Commented: (HIVE-1115) optimize combinehiveinputformat in
presence of many partitions
Posted by "Matt Pestritto (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HIVE-1115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861508#action_12861508 ]
Matt Pestritto commented on HIVE-1115:
--------------------------------------
Any eta on this issue for resolution ? There hasn't been any activity in a while and it would be significant performance increase in our environment.
Thanks
> optimize combinehiveinputformat in presence of many partitions
> --------------------------------------------------------------
>
> Key: HIVE-1115
> URL: https://issues.apache.org/jira/browse/HIVE-1115
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Paul Yang
>
> A query like :
> select .. from T where ...
> where T contains a very large number of partitions does not work very well with CombineHiveInputFomat.
> A pool is created per directory, which leads to a high number of mappers.
> In case all partitions share the same operator tree, and the same partition description, only a single pool should be created.
--
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-
You can reply to this email to add a comment to the issue online.
[jira] Assigned: (HIVE-1115) optimize combinehiveinputformat in
presence of many partitions
Posted by "Namit Jain (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HIVE-1115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Namit Jain reassigned HIVE-1115:
--------------------------------
Assignee: Namit Jain
> optimize combinehiveinputformat in presence of many partitions
> --------------------------------------------------------------
>
> Key: HIVE-1115
> URL: https://issues.apache.org/jira/browse/HIVE-1115
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Namit Jain
>
> A query like :
> select .. from T where ...
> where T contains a very large number of partitions does not work very well with CombineHiveInputFomat.
> A pool is created per directory, which leads to a high number of mappers.
> In case all partitions share the same operator tree, and the same partition description, only a single pool should be created.
--
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You can reply to this email to add a comment to the issue online.