[
https://issues.apache.org/jira/browse/SPARK-20675?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16034256#comment-16034256
]
lyc commented on SPARK-20675:
-----------------------------
What do you mean `StreamBuffer`? In commit `6d05c1` (at Jun 1/17), there is
only `ExternalAppendOnlyMap` and the computation seems only compute the
specific partition, there are not any redundancy
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org
