SizeEstimator-spark技术分享

`estimate` Method


estimate(obj: AnyRef): Long (1)
// Internal
estimate(obj: AnyRef, visited: IdentityHashMap[AnyRef, AnyRef]): Long

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estimate(obj: AnyRef): Long (1)

// Internal

estimate(obj: AnyRef, visited: IdentityHashMap[AnyRef, AnyRef]): Long

Uses estimate with an empty IdentityHashMap

estimate…FIXME

Note	`estimate` is used when: `SizeEstimator` is requested to sampleArray FIXME

`sampleArray` Internal Method


sampleArray(
  array: AnyRef,
  state: SearchState,
  rand: Random,
  drawn: OpenHashSet[Int],
  length: Int): Long

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sampleArray(

array: AnyRef,

state: SearchState,

rand: Random,

drawn: OpenHashSet[Int],

length: Int): Long

sampleArray…FIXME

Note	`sampleArray` is used when…FIXME

`visitSingleObject` Internal Method


visitSingleObject(obj: AnyRef, state: SearchState): Unit

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visitSingleObject(obj: AnyRef, state: SearchState): Unit

visitSingleObject…FIXME

Note	`visitSingleObject` is used exclusively when `SizeEstimator` is requested to estimate.

SizeEstimator

SizeEstimator

`estimate` Method

`sampleArray` Internal Method

`visitSingleObject` Internal Method

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SizeEstimator

estimate Method

sampleArray Internal Method

visitSingleObject Internal Method

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`estimate` Method

`sampleArray` Internal Method

`visitSingleObject` Internal Method