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org.apache.spark.sql.execution

ExternalAppendOnlyUnsafeRowArray

class ExternalAppendOnlyUnsafeRowArray extends Logging

An append-only array for UnsafeRows that strictly keeps content in an in-memory array until numRowsInMemoryBufferThreshold or sizeInBytesInMemoryBufferThreshold is reached post which it will switch to a mode (backed by UnsafeExternalSorter) which would flush to disk after numRowsSpillThreshold or sizeInBytesSpillThreshold is met (or before if there is excessive memory consumption). Setting these threshold involves following trade-offs:

- If numRowsInMemoryBufferThreshold and sizeInBytesInMemoryBufferThreshold are too high, the in-memory array may occupy more memory than is available, resulting in OOM. - If numRowsSpillThreshold or sizeInBytesSpillThreshold is too low, data will be spilled frequently and lead to excessive disk writes. This may lead to a performance regression compared to the normal case of using an ArrayBuffer or Array.

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Instance Constructors

  1. new ExternalAppendOnlyUnsafeRowArray(numRowsInMemoryBufferThreshold: Int, sizeInBytesInMemoryBufferThreshold: Long, numRowsSpillThreshold: Int, sizeInBytesSpillThreshold: Long)
  2. new ExternalAppendOnlyUnsafeRowArray(taskMemoryManager: TaskMemoryManager, blockManager: BlockManager, serializerManager: SerializerManager, taskContext: TaskContext, initialSize: Int, pageSizeBytes: Long, numRowsInMemoryBufferThreshold: Int, sizeInBytesInMemoryBufferThreshold: Long, numRowsSpillThreshold: Int, sizeInBytesSpillThreshold: Long)

Type Members

  1. implicit class LogStringContext extends AnyRef
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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. final def ==(arg0: Any): Boolean
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  4. def MDC(key: LogKey, value: Any): MDC
    Attributes
    protected
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  5. def add(unsafeRow: UnsafeRow): Unit
  6. final def asInstanceOf[T0]: T0
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  7. def clear(): Unit

    Clears up resources (e.g.

    Clears up resources (e.g. memory) held by the backing storage

  8. def clone(): AnyRef
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    protected[lang]
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    @throws(classOf[java.lang.CloneNotSupportedException]) @IntrinsicCandidate() @native()
  9. final def eq(arg0: AnyRef): Boolean
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  10. def equals(arg0: AnyRef): Boolean
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  11. def generateIterator(): Iterator[UnsafeRow]
  12. def generateIterator(startIndex: Int): Iterator[UnsafeRow]

    Creates an Iterator for the current rows in the array starting from a user provided index

    Creates an Iterator for the current rows in the array starting from a user provided index

    If there are subsequent add() or clear() calls made on this array after creation of the iterator, then the iterator is invalidated thus saving clients from thinking that they have read all the data while there were new rows added to this array.

  13. final def getClass(): Class[_ <: AnyRef]
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    @IntrinsicCandidate() @native()
  14. def hashCode(): Int
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  15. def initializeLogIfNecessary(isInterpreter: Boolean, silent: Boolean): Boolean
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  16. def initializeLogIfNecessary(isInterpreter: Boolean): Unit
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  17. def isEmpty: Boolean
  18. final def isInstanceOf[T0]: Boolean
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  19. def isTraceEnabled(): Boolean
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  20. def length: Int
  21. def log: Logger
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  22. def logBasedOnLevel(level: Level)(f: => MessageWithContext): Unit
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  23. def logDebug(msg: => String, throwable: Throwable): Unit
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  24. def logDebug(entry: LogEntry, throwable: Throwable): Unit
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  25. def logDebug(entry: LogEntry): Unit
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  26. def logDebug(msg: => String): Unit
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  27. def logError(msg: => String, throwable: Throwable): Unit
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  28. def logError(entry: LogEntry, throwable: Throwable): Unit
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  29. def logError(entry: LogEntry): Unit
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  30. def logError(msg: => String): Unit
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  31. def logInfo(msg: => String, throwable: Throwable): Unit
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  32. def logInfo(entry: LogEntry, throwable: Throwable): Unit
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  33. def logInfo(entry: LogEntry): Unit
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  34. def logInfo(msg: => String): Unit
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  35. def logName: String
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  36. def logTrace(msg: => String, throwable: Throwable): Unit
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  37. def logTrace(entry: LogEntry, throwable: Throwable): Unit
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  38. def logTrace(entry: LogEntry): Unit
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  39. def logTrace(msg: => String): Unit
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  40. def logWarning(msg: => String, throwable: Throwable): Unit
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  41. def logWarning(entry: LogEntry, throwable: Throwable): Unit
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  42. def logWarning(entry: LogEntry): Unit
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  43. def logWarning(msg: => String): Unit
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  44. final def ne(arg0: AnyRef): Boolean
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  45. final def notify(): Unit
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    @IntrinsicCandidate() @native()
  46. final def notifyAll(): Unit
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    @IntrinsicCandidate() @native()
  47. def spillSize: Long

    Total number of bytes that has been spilled into disk so far.

  48. final def synchronized[T0](arg0: => T0): T0
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  49. def toString(): String
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  50. final def wait(arg0: Long, arg1: Int): Unit
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    @throws(classOf[java.lang.InterruptedException])
  51. final def wait(arg0: Long): Unit
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    @throws(classOf[java.lang.InterruptedException]) @native()
  52. final def wait(): Unit
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  53. def withLogContext(context: Map[String, String])(body: => Unit): Unit
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  1. def finalize(): Unit
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    @throws(classOf[java.lang.Throwable]) @Deprecated
    Deprecated

    (Since version 9)

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