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https://issues.apache.org/jira/browse/SPARK-20232?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15957537#comment-15957537
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Apache Spark commented on SPARK-20232:
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User 'dgingrich' has created a pull request for this issue:
https://github.com/apache/spark/pull/17545
> Better combineByKey documentation: clarify memory allocation, better example
> ----------------------------------------------------------------------------
>
> Key: SPARK-20232
> URL: https://issues.apache.org/jira/browse/SPARK-20232
> Project: Spark
> Issue Type: Improvement
> Components: Documentation
> Affects Versions: 2.1.0
> Environment: macOS Sierra 10.12.4
> Spark 2.1.0 installed via Homebrew
> Reporter: David Gingrich
> Priority: Trivial
>
> combineByKey docs has a few flaws:
> - Doesn't include note about memory allocation (on aggregateBykey)
> - Example doesn't show difference between mergeValue and mergeCombiners (both
> are add)
> I have a trivial patch, will attach momentarily.
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