Packages

  • package root
    Definition Classes
    root
  • package org
    Definition Classes
    root
  • package apache
    Definition Classes
    org
  • package spark
    Definition Classes
    apache
  • package sql

    Allows the execution of relational queries, including those expressed in SQL using Spark.

    Allows the execution of relational queries, including those expressed in SQL using Spark.

    Definition Classes
    spark
  • package execution

    The physical execution component of Spark SQL.

    The physical execution component of Spark SQL. Note that this is a private package. All classes in catalyst are considered an internal API to Spark SQL and are subject to change between minor releases.

    Definition Classes
    sql
  • package python
    Definition Classes
    execution
  • object PythonForeachWriter extends Serializable
    Definition Classes
    python
  • UnsafeRowBuffer

class UnsafeRowBuffer extends Logging

A buffer that is designed for the sole purpose of buffering UnsafeRows in PythonForeachWriter. It is designed to be used with only 1 writer thread (i.e. JVM task thread) and only 1 reader thread (i.e. PythonRunner writing thread that reads from the buffer and writes to the Python worker stdin). Adds to the buffer are non-blocking, and reads through the buffer's iterator are blocking, that is, it blocks until new data is available or all data has been added.

Internally, it uses a HybridRowQueue to buffer the rows in a practically unlimited queue across memory and local disk. However, HybridRowQueue is designed to be used only with EvalPythonExec where the reader is always behind the writer, that is, the reader does not try to read n+1 rows if the writer has only written n rows at any point of time. This assumption is not true for PythonForeachWriter where rows may be added at a different rate as they are consumed by the python worker. Hence, to maintain the invariant of the reader being behind the writer while using HybridRowQueue, the buffer does the following - Keeps a count of the rows in the HybridRowQueue - Blocks the buffer's consuming iterator when the count is 0 so that the reader does not try to read more rows than what has been written.

The implementation of the blocking iterator (ReentrantLock, Condition, etc.) has been borrowed from that of ArrayBlockingQueue.

Linear Supertypes
Logging, AnyRef, Any
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Inherited
  1. UnsafeRowBuffer
  2. Logging
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Visibility
  1. Public
  2. Protected

Instance Constructors

  1. new UnsafeRowBuffer(taskMemoryManager: TaskMemoryManager, tempDir: File, numFields: Int)

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##: Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. def add(row: UnsafeRow): Unit
  5. def allRowsAdded(): Unit
  6. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  7. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  8. def close(): Unit
  9. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  10. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  11. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
  12. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  13. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  14. def initializeLogIfNecessary(isInterpreter: Boolean, silent: Boolean): Boolean
    Attributes
    protected
    Definition Classes
    Logging
  15. def initializeLogIfNecessary(isInterpreter: Boolean): Unit
    Attributes
    protected
    Definition Classes
    Logging
  16. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  17. def isTraceEnabled(): Boolean
    Attributes
    protected
    Definition Classes
    Logging
  18. val iterator: NextIterator[UnsafeRow]
  19. def log: Logger
    Attributes
    protected
    Definition Classes
    Logging
  20. def logDebug(msg: => String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  21. def logDebug(msg: => String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  22. def logError(msg: => String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  23. def logError(msg: => String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  24. def logInfo(msg: => String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  25. def logInfo(msg: => String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  26. def logName: String
    Attributes
    protected
    Definition Classes
    Logging
  27. def logTrace(msg: => String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  28. def logTrace(msg: => String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  29. def logWarning(msg: => String, throwable: Throwable): Unit
    Attributes
    protected
    Definition Classes
    Logging
  30. def logWarning(msg: => String): Unit
    Attributes
    protected
    Definition Classes
    Logging
  31. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  32. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  33. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  34. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  35. def toString(): String
    Definition Classes
    AnyRef → Any
  36. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  37. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  38. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()

Inherited from Logging

Inherited from AnyRef

Inherited from Any

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