Trait

org.apache.spark.rdd

PartitionCoalescer

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trait PartitionCoalescer extends AnyRef

::DeveloperApi:: A PartitionCoalescer defines how to coalesce the partitions of a given RDD.

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@DeveloperApi()
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coalesce-public.scala
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Abstract Value Members

  1. abstract def coalesce(maxPartitions: Int, parent: RDD[_]): Array[PartitionGroup]

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    Coalesce the partitions of the given RDD.

    Coalesce the partitions of the given RDD.

    maxPartitions

    the maximum number of partitions to have after coalescing

    parent

    the parent RDD whose partitions to coalesce

    returns

    an array of PartitionGroups, where each element is itself an array of Partitions and represents a partition after coalescing is performed.

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