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From "Apache Spark (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (SPARK-21410) In RangePartitioner(partitions: Int, rdd: RDD[]), RangePartitioner.numPartitions is wrong if the number of elements in RDD (rdd.count()) is less than number of partitions (partitions in constructor).
Date Fri, 14 Jul 2017 02:11:00 GMT

     [ https://issues.apache.org/jira/browse/SPARK-21410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Apache Spark reassigned SPARK-21410:
------------------------------------

    Assignee:     (was: Apache Spark)

> In RangePartitioner(partitions: Int, rdd: RDD[]), RangePartitioner.numPartitions is wrong
if the number of elements in RDD (rdd.count()) is less than number of partitions (partitions
in constructor).
> -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-21410
>                 URL: https://issues.apache.org/jira/browse/SPARK-21410
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 2.0.0, 2.1.0, 2.2.0
>            Reporter: APeng Zhang
>            Priority: Minor
>
> In RangePartitioner(partitions: Int, rdd: RDD[]), RangePartitioner.numPartitions is wrong
if the number of elements in RDD (rdd.count()) is less than number of partitions (partitions
in constructor).
> Code1 to reproduce:
> {code:java}
>     import spark.implicits._
>     val ds = spark.createDataset(Seq((1, 1)))
>     println(ds.sort("_1").rdd.getNumPartitions)
>     // The output of println is 2
> {code}
> Code2 to reproduce:
> {code:java}
>   test("Number of elements in RDD is less than number of partitions") {
>     val rdd = sc.parallelize(1 to 3).map(x => (x, x))
>     val partitioner = new RangePartitioner(22, rdd)
>     assert(partitioner.numPartitions === 3)
>   }
> {code}
>   This test will be failed because partitioner.numPartitions is 4.



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