package util
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- abstract class AccumulatorV2[IN, OUT] extends Serializable
The base class for accumulators, that can accumulate inputs of type
IN, and produce output of typeOUT.The base class for accumulators, that can accumulate inputs of type
IN, and produce output of typeOUT.OUTshould be a type that can be read atomically (e.g., Int, Long), or thread-safely (e.g., synchronized collections) because it will be read from other threads. - class ChildFirstURLClassLoader extends MutableURLClassLoader
A mutable class loader that gives preference to its own URLs over the parent class loader when loading classes and resources.
- class CollectionAccumulator[T] extends AccumulatorV2[T, List[T]]
An accumulator for collecting a list of elements.
An accumulator for collecting a list of elements.
- Since
2.0.0
- class DayTimeIntervalUtils extends AnyRef
- class DoubleAccumulator extends AccumulatorV2[Double, Double]
An accumulator for computing sum, count, and averages for double precision floating numbers.
An accumulator for computing sum, count, and averages for double precision floating numbers.
- Since
2.0.0
- class EnumUtil extends AnyRef
- Annotations
- @Private()
- class LongAccumulator extends AccumulatorV2[Long, Long]
An accumulator for computing sum, count, and average of 64-bit integers.
An accumulator for computing sum, count, and average of 64-bit integers.
- Since
2.0.0
- case class MutablePair[T1, T2](_1: T1, _2: T2) extends Product2[T1, T2] with Product with Serializable
:: DeveloperApi :: A tuple of 2 elements.
:: DeveloperApi :: A tuple of 2 elements. This can be used as an alternative to Scala's Tuple2 when we want to minimize object allocation.
- _1
Element 1 of this MutablePair
- _2
Element 2 of this MutablePair
- Annotations
- @DeveloperApi()
- class MutableURLClassLoader extends URLClassLoader
URL class loader that exposes the
addURLmethod in URLClassLoader. - class ParentClassLoader extends ClassLoader
A class loader which makes some protected methods in ClassLoader accessible.
- class SerializableConfiguration extends Serializable
Hadoop configuration but serializable.
Hadoop configuration but serializable. Use
valueto access the Hadoop configuration.- Annotations
- @DeveloperApi() @Unstable()
- trait SparkTestUtils extends AnyRef
- class StatCounter extends Serializable
A class for tracking the statistics of a set of numbers (count, mean and variance) in a numerically robust way.
A class for tracking the statistics of a set of numbers (count, mean and variance) in a numerically robust way. Includes support for merging two StatCounters. Based on Welford and Chan's algorithms for running variance.
- trait TaskCompletionListener extends EventListener
:: DeveloperApi ::
:: DeveloperApi ::
Listener providing a callback function to invoke when a task's execution completes.
- Annotations
- @DeveloperApi()
- trait TaskFailureListener extends EventListener
:: DeveloperApi ::
:: DeveloperApi ::
Listener providing a callback function to invoke when a task's execution encounters an error. Operations defined here must be idempotent, as
onTaskFailurecan be called multiple times.- Annotations
- @DeveloperApi()
- class YearMonthIntervalUtils extends AnyRef
Value Members
- object LogUtils
:: : DeveloperApi :: Utils for querying Spark logs with Spark SQL.
:: : DeveloperApi :: Utils for querying Spark logs with Spark SQL.
- Annotations
- @DeveloperApi()
- Since
4.0.0
- object SizeEstimator extends Logging
:: DeveloperApi :: Estimates the sizes of Java objects (number of bytes of memory they occupy), for use in memory-aware caches.
:: 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: https://www.infoworld.com/article/2077408/sizeof-for-java.html
- Annotations
- @DeveloperApi()
- object SparkEnvUtils extends SparkEnvUtils
- object SparkTestUtils extends SparkTestUtils
- object StatCounter extends Serializable