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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2017/07/14 02:11:00 UTC
[jira] [Commented] (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).
[ https://issues.apache.org/jira/browse/SPARK-21410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16086731#comment-16086731 ]
Apache Spark commented on SPARK-21410:
--------------------------------------
User 'apapi' has created a pull request for this issue:
https://github.com/apache/spark/pull/18631
> 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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