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Posted to dev@pig.apache.org by "Olga Natkovich (JIRA)" <ji...@apache.org> on 2009/06/12 01:53:07 UTC
[jira] Created: (PIG-844) PERFORMANCE: streaming data to the UDFs
in foreach
PERFORMANCE: streaming data to the UDFs in foreach
--------------------------------------------------
Key: PIG-844
URL: https://issues.apache.org/jira/browse/PIG-844
Project: Pig
Issue Type: Improvement
Reporter: Olga Natkovich
Currently, Pig places the data passed to UDFs into a bag. This can cause the process to use more memory than actually needed as in many cases it would be better to push the data one tuple at a time to the UDFs.
For the case where combiner is invoked, this might not be that important; however, for non-algebraic UDFs as well as other cases where combiner can't be used, this can provide significant memory improvement.
Another possible use case is where the data is already grouped going into pig and we don't need to group it again.
How this will effect UDF interface needs to be further discussed.
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[jira] Resolved: (PIG-844) PERFORMANCE: streaming data to the UDFs
in foreach
Posted by "Olga Natkovich (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/PIG-844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Olga Natkovich resolved PIG-844.
--------------------------------
accumulate interface took care of this.
> PERFORMANCE: streaming data to the UDFs in foreach
> --------------------------------------------------
>
> Key: PIG-844
> URL: https://issues.apache.org/jira/browse/PIG-844
> Project: Pig
> Issue Type: Improvement
> Reporter: Olga Natkovich
>
> Currently, Pig places the data passed to UDFs into a bag. This can cause the process to use more memory than actually needed as in many cases it would be better to push the data one tuple at a time to the UDFs.
> For the case where combiner is invoked, this might not be that important; however, for non-algebraic UDFs as well as other cases where combiner can't be used, this can provide significant memory improvement.
> Another possible use case is where the data is already grouped going into pig and we don't need to group it again.
> How this will effect UDF interface needs to be further discussed.
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[jira] Closed: (PIG-844) PERFORMANCE: streaming data to the UDFs in
foreach
Posted by "Daniel Dai (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/PIG-844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daniel Dai closed PIG-844.
--------------------------
> PERFORMANCE: streaming data to the UDFs in foreach
> --------------------------------------------------
>
> Key: PIG-844
> URL: https://issues.apache.org/jira/browse/PIG-844
> Project: Pig
> Issue Type: Improvement
> Reporter: Olga Natkovich
> Fix For: 0.7.0
>
>
> Currently, Pig places the data passed to UDFs into a bag. This can cause the process to use more memory than actually needed as in many cases it would be better to push the data one tuple at a time to the UDFs.
> For the case where combiner is invoked, this might not be that important; however, for non-algebraic UDFs as well as other cases where combiner can't be used, this can provide significant memory improvement.
> Another possible use case is where the data is already grouped going into pig and we don't need to group it again.
> How this will effect UDF interface needs to be further discussed.
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You can reply to this email to add a comment to the issue online.