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https://issues.apache.org/jira/browse/SPARK-9850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15096985#comment-15096985
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Maciej Bryński edited comment on SPARK-9850 at 1/13/16 9:13 PM:
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[~matei]
Hi,
I'm not sure if my issue is related to this Jira.
In 1.6.0 when using sql limit Spark do following:
- execute limit on every partition
- then take result
Is it possible to finish scanning partitions when we collect enough rows for
limit ?
was (Author: maver1ck):
[~matei]
Hi,
I'm not sure if my issue is related to this Jira.
In 1.6.0 when using sql limit Spark do following:
- execute limit on every partition
- then take result
Is it possible to finish scanning partitions when we collect enough rows for
limit ?
> Adaptive execution in Spark
> ---------------------------
>
> Key: SPARK-9850
> URL: https://issues.apache.org/jira/browse/SPARK-9850
> Project: Spark
> Issue Type: Epic
> Components: Spark Core, SQL
> Reporter: Matei Zaharia
> Assignee: Yin Huai
> Attachments: AdaptiveExecutionInSpark.pdf
>
>
> Query planning is one of the main factors in high performance, but the
> current Spark engine requires the execution DAG for a job to be set in
> advance. Even with cost-based optimization, it is hard to know the behavior
> of data and user-defined functions well enough to always get great execution
> plans. This JIRA proposes to add adaptive query execution, so that the engine
> can change the plan for each query as it sees what data earlier stages
> produced.
> We propose adding this to Spark SQL / DataFrames first, using a new API in
> the Spark engine that lets libraries run DAGs adaptively. In future JIRAs,
> the functionality could be extended to other libraries or the RDD API, but
> that is more difficult than adding it in SQL.
> I've attached a design doc by Yin Huai and myself explaining how it would
> work in more detail.
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