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Posted to issues@spark.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2015/12/18 18:27:46 UTC
[jira] [Commented] (SPARK-10291) Add statsByKey method to compute
StatCounters for each key in an RDD
[ https://issues.apache.org/jira/browse/SPARK-10291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15064266#comment-15064266 ]
Sean Owen commented on SPARK-10291:
-----------------------------------
My POV is that this isn't likely worth adding a method for. I appreciate the value of utility methods but have to weight it against adding another item to a core API and how often it'd be used. This is also straightforward to express in Spark SQL on a dataframe, no?
> Add statsByKey method to compute StatCounters for each key in an RDD
> --------------------------------------------------------------------
>
> Key: SPARK-10291
> URL: https://issues.apache.org/jira/browse/SPARK-10291
> Project: Spark
> Issue Type: New Feature
> Components: PySpark
> Reporter: Erik Shilts
> Priority: Minor
>
> A common task is to summarize numerical data for different groups. Having a `statsByKey` method would simplify this so the user would not have to write the aggregators for all the statistics or manage collecting by key and computing individual StatCounters.
> This should be a straightforward addition to PySpark. I can look into adding to Scala and R if we want to maintain feature parity.
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