What's the bug? Each element is sampled with probability 0.5. I think the expected size is 14 but not all samples would be that size. On Mar 17, 2015 12:12 AM, "Marko Bonaci (JIRA)" <j...@apache.org> wrote:
> Marko Bonaci created SPARK-6370: > ----------------------------------- > > Summary: RDD sampling with replacement intermittently yields > incorrect number of samples > Key: SPARK-6370 > URL: https://issues.apache.org/jira/browse/SPARK-6370 > Project: Spark > Issue Type: Bug > Components: Spark Core > Affects Versions: 1.2.1, 1.3.0 > Environment: Ubuntu 14.04 64-bit, spark-1.3.0-bin-hadoop2.4 > Reporter: Marko Bonaci > > > Here's the repl output: > > {{code:java}} > scala> uniqueIds.collect > res10: Array[String] = Array(4, 8, 21, 80, 20, 98, 42, 15, 48, 36, 90, 46, > 55, 16, 31, 71, 9, 50, 28, 61, 68, 85, 12, 94, 38, 77, 2, 11, 10) > > scala> val swr = uniqueIds.sample(true, 0.5) > swr: org.apache.spark.rdd.RDD[String] = PartitionwiseSampledRDD[22] at > sample at <console>:27 > > scala> swr.count > res17: Long = 16 > > scala> val swr = uniqueIds.sample(true, 0.5) > swr: org.apache.spark.rdd.RDD[String] = PartitionwiseSampledRDD[23] at > sample at <console>:27 > > scala> swr.count > res18: Long = 8 > > scala> val swr = uniqueIds.sample(true, 0.5) > swr: org.apache.spark.rdd.RDD[String] = PartitionwiseSampledRDD[24] at > sample at <console>:27 > > scala> swr.count > res19: Long = 18 > > scala> val swr = uniqueIds.sample(true, 0.5) > swr: org.apache.spark.rdd.RDD[String] = PartitionwiseSampledRDD[25] at > sample at <console>:27 > > scala> swr.count > res20: Long = 15 > > scala> val swr = uniqueIds.sample(true, 0.5) > swr: org.apache.spark.rdd.RDD[String] = PartitionwiseSampledRDD[26] at > sample at <console>:27 > > scala> swr.count > res21: Long = 11 > > scala> val swr = uniqueIds.sample(true, 0.5) > swr: org.apache.spark.rdd.RDD[String] = PartitionwiseSampledRDD[27] at > sample at <console>:27 > > scala> swr.count > res22: Long = 10 > {{code}} > > > > -- > 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 > >
