[jira] [Resolved] (SPARK-16551) Accumulator Examples should demonstrate different use case from UDAFs

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-16551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hyukjin Kwon resolved SPARK-16551.
----------------------------------
    Resolution: Incomplete

> 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
>              Labels: bulk-closed
>
> 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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