Class

com.datastax.spark.connector.rdd.partitioner

TokenRangeClusterer

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

Divides a set of token rangesContaining into groups containing not more than maxRowCountPerGroup rows and not more than maxGroupSize token rangesContaining. Each group will form a single CassandraPartition.

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

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Instance Constructors

  1. new TokenRangeClusterer(maxRowCountPerGroup: Long, 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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    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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  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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