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Apache Spark commented on SPARK-16961: -------------------------------------- User 'nicklavers' has created a pull request for this issue: https://github.com/apache/spark/pull/14551 > Utils.randomizeInPlace does not shuffle arrays uniformly > -------------------------------------------------------- > > Key: SPARK-16961 > URL: https://issues.apache.org/jira/browse/SPARK-16961 > Project: Spark > Issue Type: Bug > Components: Spark Core > Affects Versions: 2.0.0 > Reporter: Nicholas > Priority: Minor > Original Estimate: 0h > Remaining Estimate: 0h > > The Utils.randomizeInPlace method, which is meant to uniformly shuffle the > elements on an input array, never shuffles elements to their starting > position. That is, every permutation of the input array is equally likely to > be returned, except for any permutation in which any element is in the same > position where it began. These permutations are never output. > This is because line 827 of Utils.scala should be > {{val j = rand.nextInt(i + 1)}} > instead of > {{val j = rand.nextInt( i )}} -- 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