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From "Ruiming Zhou (JIRA)" <j...@apache.org>
Subject [jira] [Issue Comment Deleted] (SPARK-16551) Accumulator Examples should demonstrate different use case from UDAFs
Date Wed, 30 Nov 2016 17:36:59 GMT

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

Ruiming Zhou updated SPARK-16551:
---------------------------------
    Comment: was deleted

(was: 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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