Florian Verhein created SPARK-6665: -------------------------------------- Summary: Randomly Shuffle an RDD Key: SPARK-6665 URL: https://issues.apache.org/jira/browse/SPARK-6665 Project: Spark Issue Type: New Feature Components: Spark Shell Reporter: Florian Verhein Priority: Minor
*Use case* RDD created in a way that has some ordering, but you need to shuffle it because the ordering would cause problems downstream. E.g. - will be used to train a ML algorithm that makes stochastic assumptions (like SGD) - used as input for cross validation. e.g. after the shuffle, you could just grab partitions (or part files if saved to hdfs) as folds Related question in mailing list: http://apache-spark-user-list.1001560.n3.nabble.com/random-shuffle-streaming-RDDs-td17965.html *Possible implementation* As mentioned by [~sowen] in the above thread, could sort by( a good hash of( the element (or key if it's paired) and a random salt)). -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org