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Posted to issues@spark.apache.org by "Ruiming Zhou (JIRA)" <ji...@apache.org> on 2016/11/29 22:33:59 UTC
[jira] [Commented] (SPARK-16551) Accumulator Examples should
demonstrate different use case from UDAFs
[ https://issues.apache.org/jira/browse/SPARK-16551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15706764#comment-15706764 ]
Ruiming Zhou commented on SPARK-16551:
--------------------------------------
I can look at this issue.
> Accumulator Examples should demonstrate different use case from UDAFs
> ---------------------------------------------------------------------
>
> Key: SPARK-16551
> URL: https://issues.apache.org/jira/browse/SPARK-16551
> Project: Spark
> Issue Type: Documentation
> Reporter: Vladimir Feinberg
> Priority: Minor
>
> Currently, the Spark programming guide demonstrates Accumulators (http://spark.apache.org/docs/latest/programming-guide.html#accumulators) by taking the sum of an RDD.
> This example makes new users think that Accumulators serve the role that UDAFs do, which they don't. They're meant to be out-of-band, small values that don't break pipe-lining. Documentation examples and notes should reflect this (and warn that they may cause driver bottlenecks).
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