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 def coalesce(maxPartitions: Int, parent: RDD[_]): Array[PartitionGroup]
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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(Since version 9)