Andrew Ash created SPARK-2148:
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Summary: Document custom class as key needing equals() AND
hashcode()
Key: SPARK-2148
URL: https://issues.apache.org/jira/browse/SPARK-2148
Project: Spark
Issue Type: Bug
Components: Documentation
Affects Versions: 1.0.0
Reporter: Andrew Ash
Several support requests on user@ have been tracked down to using a custom
class as the key in a {{groupByKey()}} or {{reduceByKey()}} that has a custom
{{equals()}} method but not the corresponding custom {{hashcode()}} method.
Let's add a note in the documentation that custom keys need both {{equals()}}
and {{hashcode()}} overridden, never just {{equals()}}
The right place for this addition might be as a sub-section or note in
http://spark.apache.org/docs/latest/programming-guide.html#working-with-key-value-pairs
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