Derrick Burns created SPARK-5917:
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Summary: Distinct is broken
Key: SPARK-5917
URL: https://issues.apache.org/jira/browse/SPARK-5917
Project: Spark
Issue Type: Bug
Components: MLlib
Affects Versions: 1.1.1
Environment: Spark 1.1.1 running on YARN 2.4 via Amazon EMR.
Reporter: Derrick Burns
Priority: Critical
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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