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https://issues.apache.org/jira/browse/SPARK-20675?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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darion yaphet updated SPARK-20675:
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Description:
CoGroupedRDD's compute() will retrieval each StreamBuffer(a disk structure
maintains key-value pairs which sorted by key) and merge the same key into one
So I think add a sequence index file or append the index part at the head of
temporary shuffle file to seek to the appropriate position could skip a lot of
scan which are unnecessary.
> Support Index to skip when retrieval disk structure in CoGroupedRDD
> --------------------------------------------------------------------
>
> Key: SPARK-20675
> URL: https://issues.apache.org/jira/browse/SPARK-20675
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.1.1
> Reporter: darion yaphet
>
> CoGroupedRDD's compute() will retrieval each StreamBuffer(a disk structure
> maintains key-value pairs which sorted by key) and merge the same key into one
> So I think add a sequence index file or append the index part at the head of
> temporary shuffle file to seek to the appropriate position could skip a lot
> of scan which are unnecessary.
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