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https://issues.apache.org/jira/browse/SPARK-5917?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-5917:
-----------------------------
    Component/s:     (was: MLlib)
                 Spark Core
       Priority: Major  (was: Critical)

I can't reproduce this locally or with Hadoop / HDFS / YARN on a few sample 
data sets. I tried caching and no caching. Downgrading for now.

> Distinct is broken
> ------------------
>
>                 Key: SPARK-5917
>                 URL: https://issues.apache.org/jira/browse/SPARK-5917
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 1.1.1
>         Environment: Spark 1.1.1 running on YARN 2.4 via Amazon EMR.
>            Reporter: Derrick Burns
>
> I hate to file bugs that are hard to reproduce (by other people), but after 
> spending a full week trying to debug my code, I constructed a scenario where 
> the following assertion FAILS.
> val x : RDD[T] = ....
> val y = x.distinct()
> assert( y.count() <= x.count() )
> I am at a complete loss as to how this can occur under ANY definition of 
> equality/order unless the RDD underlying x is mutable. Since none of my RDD 
> transforms mutate any existing RDD data and I am reading from immutable 
> sources (data on S3), I conclude that there must be a bug in Spark or I am 
> mutating my data unknowingly.   



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