Daniel Darabos created SPARK-8893:
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Summary: Require positive partition counts in RDD.repartition
Key: SPARK-8893
URL: https://issues.apache.org/jira/browse/SPARK-8893
Project: Spark
Issue Type: Improvement
Affects Versions: 1.4.0
Reporter: Daniel Darabos
Priority: Trivial
What does {{sc.parallelize(1 to 3).repartition(x).collect}} return? I would
expect {{Array(1, 2, 3)}} regardless of {{x}}. But if {{x}} < 1, it returns
{{Array()}}. I think instead it should throw an {{IllegalArgumentException}}.
I think the case is pretty clear for {{x}} < 0. But the behavior for {{x}} = 0
is also error prone. In fact that's how I found this strange behavior. I used
{{rdd.repartition(a/b)}} with positive {{a}} and {{b}}, but {{a/b}} was rounded
down to zero and the results surprised me. I'd prefer an exception instead of
unexpected (corrupt) results.
I'm happy to send a pull request for this.
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