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org.apache.spark.util

SizeEstimator

object SizeEstimator extends Logging

:: DeveloperApi :: Estimates the sizes of Java objects (number of bytes of memory they occupy), for use in memory-aware caches.

Based on the following JavaWorld article: http://www.javaworld.com/javaworld/javaqa/2003-12/02-qa-1226-sizeof.html

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@DeveloperApi()
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  1. final def !=(arg0: Any): Boolean
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. final def asInstanceOf[T0]: T0
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  5. def clone(): AnyRef
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    protected[java.lang]
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    @native() @throws( ... )
  6. final def eq(arg0: AnyRef): Boolean
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  7. def equals(arg0: Any): Boolean
    Definition Classes
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  8. def estimate(obj: AnyRef): Long

    Estimate the number of bytes that the given object takes up on the JVM heap.

    Estimate the number of bytes that the given object takes up on the JVM heap. The estimate includes space taken up by objects referenced by the given object, their references, and so on and so forth.

    This is useful for determining the amount of heap space a broadcast variable will occupy on each executor or the amount of space each object will take when caching objects in deserialized form. This is not the same as the serialized size of the object, which will typically be much smaller.

  9. def finalize(): Unit
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    protected[java.lang]
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    @throws( classOf[java.lang.Throwable] )
  10. final def getClass(): Class[_]
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    @native()
  11. def hashCode(): Int
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    @native()
  12. def initializeLogIfNecessary(isInterpreter: Boolean, silent: Boolean = false): Boolean
    Attributes
    protected
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    Logging
  13. def initializeLogIfNecessary(isInterpreter: Boolean): Unit
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    protected
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    Logging
  14. final def isInstanceOf[T0]: Boolean
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  15. def isTraceEnabled(): Boolean
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    protected
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    Logging
  16. def log: Logger
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    protected
    Definition Classes
    Logging
  17. def logDebug(msg: ⇒ String, throwable: Throwable): Unit
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    protected
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    Logging
  18. def logDebug(msg: ⇒ String): Unit
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    protected
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    Logging
  19. def logError(msg: ⇒ String, throwable: Throwable): Unit
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    protected
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    Logging
  20. def logError(msg: ⇒ String): Unit
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    protected
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    Logging
  21. def logInfo(msg: ⇒ String, throwable: Throwable): Unit
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  22. def logInfo(msg: ⇒ String): Unit
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  23. def logName: String
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  24. def logTrace(msg: ⇒ String, throwable: Throwable): Unit
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    Logging
  25. def logTrace(msg: ⇒ String): Unit
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    protected
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    Logging
  26. def logWarning(msg: ⇒ String, throwable: Throwable): Unit
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    protected
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    Logging
  27. def logWarning(msg: ⇒ String): Unit
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    Logging
  28. final def ne(arg0: AnyRef): Boolean
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  29. final def notify(): Unit
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    @native()
  30. final def notifyAll(): Unit
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    @native()
  31. final def synchronized[T0](arg0: ⇒ T0): T0
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  32. def toString(): String
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  33. final def wait(): Unit
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    @throws( ... )
  34. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
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    @throws( ... )
  35. final def wait(arg0: Long): Unit
    Definition Classes
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    @native() @throws( ... )

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