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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2019/05/21 04:01:11 UTC
[jira] [Updated] (SPARK-20675) Support Index to skip when retrieval
disk structure in CoGroupedRDD
[ https://issues.apache.org/jira/browse/SPARK-20675?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon updated SPARK-20675:
---------------------------------
Labels: bulk-closed (was: )
> 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
> Priority: Major
> Labels: bulk-closed
>
> 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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