Class/Object

com.datastax.spark.connector.rdd.partitioner

TokenRangeClusterer

Related Docs: object TokenRangeClusterer | package partitioner

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class TokenRangeClusterer[V, T <: Token[V]] extends AnyRef

Groups a set of token ranges into groupCount groups containing not more than maxGroupSize token ranges. Each group will form a single CassandraRDDPartition.

The algorithm is as follows: 1. Sort token ranges by endpoints lexicographically. 2. Take the highest possible number of token ranges from the beginning of the list, such that their sum of ringFraction does not exceed ringFractionPerGroup and they all contain at least one common endpoint. If it is not possible, take at least one item. Those token ranges will make a group. 3. Repeat the previous step until no more token ranges left.

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Instance Constructors

  1. new TokenRangeClusterer(groupCount: Int, maxGroupSize: Int = Int.MaxValue)

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Value Members

  1. final def !=(arg0: Any): Boolean

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  2. final def ##(): Int

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  3. def +(other: String): String

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    Implicit information
    This member is added by an implicit conversion from TokenRangeClusterer[V, T] to any2stringadd[TokenRangeClusterer[V, T]] performed by method any2stringadd in scala.Predef.
    Definition Classes
    any2stringadd
  4. def ->[B](y: B): (TokenRangeClusterer[V, T], B)

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    Implicit information
    This member is added by an implicit conversion from TokenRangeClusterer[V, T] to ArrowAssoc[TokenRangeClusterer[V, T]] performed by method ArrowAssoc in scala.Predef.
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    @inline()
  5. final def ==(arg0: Any): Boolean

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  6. final def asInstanceOf[T0]: T0

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  7. def clone(): AnyRef

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  8. def ensuring(cond: (TokenRangeClusterer[V, T]) ⇒ Boolean, msg: ⇒ Any): TokenRangeClusterer[V, T]

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    Implicit information
    This member is added by an implicit conversion from TokenRangeClusterer[V, T] to Ensuring[TokenRangeClusterer[V, T]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  9. def ensuring(cond: (TokenRangeClusterer[V, T]) ⇒ Boolean): TokenRangeClusterer[V, T]

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    Implicit information
    This member is added by an implicit conversion from TokenRangeClusterer[V, T] to Ensuring[TokenRangeClusterer[V, T]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  10. def ensuring(cond: Boolean, msg: ⇒ Any): TokenRangeClusterer[V, T]

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    Implicit information
    This member is added by an implicit conversion from TokenRangeClusterer[V, T] to Ensuring[TokenRangeClusterer[V, T]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  11. def ensuring(cond: Boolean): TokenRangeClusterer[V, T]

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    Implicit information
    This member is added by an implicit conversion from TokenRangeClusterer[V, T] to Ensuring[TokenRangeClusterer[V, T]] performed by method Ensuring in scala.Predef.
    Definition Classes
    Ensuring
  12. final def eq(arg0: AnyRef): Boolean

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  13. def equals(arg0: Any): Boolean

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  14. def finalize(): Unit

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  15. def formatted(fmtstr: String): String

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    Implicit information
    This member is added by an implicit conversion from TokenRangeClusterer[V, T] to StringFormat[TokenRangeClusterer[V, T]] performed by method StringFormat in scala.Predef.
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    @inline()
  16. final def getClass(): Class[_]

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  17. def group(tokenRanges: Seq[TokenRange[V, T]]): Iterable[Seq[TokenRange[V, T]]]

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    Groups small token ranges on the same server(s) in order to reduce task scheduling overhead.

    Groups small token ranges on the same server(s) in order to reduce task scheduling overhead. Useful mostly with virtual nodes, which may create lots of small token range splits. Each group will make a single Spark task.

  18. def hashCode(): Int

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  19. final def isInstanceOf[T0]: Boolean

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  20. final def ne(arg0: AnyRef): Boolean

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  21. final def notify(): Unit

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  22. final def notifyAll(): Unit

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  23. final def synchronized[T0](arg0: ⇒ T0): T0

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  24. def toString(): String

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  25. final def wait(): Unit

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  26. final def wait(arg0: Long, arg1: Int): Unit

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  27. final def wait(arg0: Long): Unit

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  28. def [B](y: B): (TokenRangeClusterer[V, T], B)

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    Implicit information
    This member is added by an implicit conversion from TokenRangeClusterer[V, T] to ArrowAssoc[TokenRangeClusterer[V, T]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
    ArrowAssoc

Inherited from AnyRef

Inherited from Any

Inherited by implicit conversion any2stringadd from TokenRangeClusterer[V, T] to any2stringadd[TokenRangeClusterer[V, T]]

Inherited by implicit conversion StringFormat from TokenRangeClusterer[V, T] to StringFormat[TokenRangeClusterer[V, T]]

Inherited by implicit conversion Ensuring from TokenRangeClusterer[V, T] to Ensuring[TokenRangeClusterer[V, T]]

Inherited by implicit conversion ArrowAssoc from TokenRangeClusterer[V, T] to ArrowAssoc[TokenRangeClusterer[V, T]]

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