Class

org.apache.spark.sql.execution

CoalesceExec

Related Doc: package execution

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case class CoalesceExec(numPartitions: Int, child: SparkPlan) extends SparkPlan with UnaryExecNode with Product with Serializable

Physical plan for returning a new RDD that has exactly numPartitions partitions. Similar to coalesce defined on an RDD, this operation results in a narrow dependency, e.g. if you go from 1000 partitions to 100 partitions, there will not be a shuffle, instead each of the 100 new partitions will claim 10 of the current partitions. If a larger number of partitions is requested, it will stay at the current number of partitions.

However, if you're doing a drastic coalesce, e.g. to numPartitions = 1, this may result in your computation taking place on fewer nodes than you like (e.g. one node in the case of numPartitions = 1). To avoid this, you see ShuffleExchange. This will add a shuffle step, but means the current upstream partitions will be executed in parallel (per whatever the current partitioning is).

Linear Supertypes
UnaryExecNode, SparkPlan, Serializable, Serializable, Logging, QueryPlan[SparkPlan], TreeNode[SparkPlan], Product, Equals, AnyRef, Any
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Inherited
  1. CoalesceExec
  2. UnaryExecNode
  3. SparkPlan
  4. Serializable
  5. Serializable
  6. Logging
  7. QueryPlan
  8. TreeNode
  9. Product
  10. Equals
  11. AnyRef
  12. Any
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Visibility
  1. Public
  2. All

Instance Constructors

  1. new CoalesceExec(numPartitions: Int, child: SparkPlan)

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Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any
  4. lazy val allAttributes: AttributeSeq

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    Definition Classes
    QueryPlan
  5. def apply(number: Int): TreeNode[_]

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    Definition Classes
    TreeNode
  6. def argString: String

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    Definition Classes
    TreeNode
  7. def asCode: String

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    Definition Classes
    TreeNode
  8. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any
  9. lazy val canonicalized: SparkPlan

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    Attributes
    protected
    Definition Classes
    QueryPlan
  10. val child: SparkPlan

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    Definition Classes
    CoalesceExecUnaryExecNode
  11. final def children: Seq[SparkPlan]

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    Definition Classes
    UnaryExecNode → TreeNode
  12. lazy val cleanArgs: Seq[Any]

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    Attributes
    protected
    Definition Classes
    QueryPlan
  13. def cleanExpression(e: Expression): Expression

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    Attributes
    protected
    Definition Classes
    QueryPlan
  14. def clone(): AnyRef

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  15. def collect[B](pf: PartialFunction[SparkPlan, B]): Seq[B]

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    Definition Classes
    TreeNode
  16. def collectFirst[B](pf: PartialFunction[SparkPlan, B]): Option[B]

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    Definition Classes
    TreeNode
  17. def collectLeaves(): Seq[SparkPlan]

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    Definition Classes
    TreeNode
  18. lazy val constraints: ExpressionSet

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    Definition Classes
    QueryPlan
  19. lazy val containsChild: Set[TreeNode[_]]

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    Definition Classes
    TreeNode
  20. def doExecute(): RDD[InternalRow]

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    Overridden by concrete implementations of SparkPlan.

    Overridden by concrete implementations of SparkPlan. Produces the result of the query as an RDD[InternalRow]

    Attributes
    protected
    Definition Classes
    CoalesceExecSparkPlan
  21. def doExecuteBroadcast[T](): Broadcast[T]

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    Overridden by concrete implementations of SparkPlan.

    Overridden by concrete implementations of SparkPlan. Produces the result of the query as a broadcast variable.

    Attributes
    protected[org.apache.spark.sql]
    Definition Classes
    SparkPlan
  22. def doPrepare(): Unit

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    Overridden by concrete implementations of SparkPlan.

    Overridden by concrete implementations of SparkPlan. It is guaranteed to run before any execute of SparkPlan. This is helpful if we want to set up some state before executing the query, e.g., BroadcastHashJoin uses it to broadcast asynchronously.

    Note: the prepare method has already walked down the tree, so the implementation doesn't need to call children's prepare methods.

    This will only be called once, protected by this.

    Attributes
    protected
    Definition Classes
    SparkPlan
  23. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  24. final def execute(): RDD[InternalRow]

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    Returns the result of this query as an RDD[InternalRow] by delegating to doExecute after preparations.

    Returns the result of this query as an RDD[InternalRow] by delegating to doExecute after preparations.

    Concrete implementations of SparkPlan should override doExecute.

    Definition Classes
    SparkPlan
  25. final def executeBroadcast[T](): Broadcast[T]

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    Returns the result of this query as a broadcast variable by delegating to doExecuteBroadcast after preparations.

    Returns the result of this query as a broadcast variable by delegating to doExecuteBroadcast after preparations.

    Concrete implementations of SparkPlan should override doExecuteBroadcast.

    Definition Classes
    SparkPlan
  26. def executeCollect(): Array[InternalRow]

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    Runs this query returning the result as an array.

    Runs this query returning the result as an array.

    Definition Classes
    SparkPlan
  27. def executeCollectPublic(): Array[Row]

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    Runs this query returning the result as an array, using external Row format.

    Runs this query returning the result as an array, using external Row format.

    Definition Classes
    SparkPlan
  28. final def executeQuery[T](query: ⇒ T): T

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    Execute a query after preparing the query and adding query plan information to created RDDs for visualization.

    Execute a query after preparing the query and adding query plan information to created RDDs for visualization.

    Attributes
    protected
    Definition Classes
    SparkPlan
  29. def executeTake(n: Int): Array[InternalRow]

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    Runs this query returning the first n rows as an array.

    Runs this query returning the first n rows as an array.

    This is modeled after RDD.take but never runs any job locally on the driver.

    Definition Classes
    SparkPlan
  30. def executeToIterator(): Iterator[InternalRow]

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    Runs this query returning the result as an iterator of InternalRow.

    Runs this query returning the result as an iterator of InternalRow.

    Note: this will trigger multiple jobs (one for each partition).

    Definition Classes
    SparkPlan
  31. final def expressions: Seq[Expression]

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    Definition Classes
    QueryPlan
  32. def fastEquals(other: TreeNode[_]): Boolean

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    Definition Classes
    TreeNode
  33. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  34. def find(f: (SparkPlan) ⇒ Boolean): Option[SparkPlan]

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    Definition Classes
    TreeNode
  35. def flatMap[A](f: (SparkPlan) ⇒ TraversableOnce[A]): Seq[A]

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    Definition Classes
    TreeNode
  36. def foreach(f: (SparkPlan) ⇒ Unit): Unit

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    Definition Classes
    TreeNode
  37. def foreachUp(f: (SparkPlan) ⇒ Unit): Unit

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    Definition Classes
    TreeNode
  38. def generateTreeString(depth: Int, lastChildren: Seq[Boolean], builder: StringBuilder, verbose: Boolean, prefix: String): StringBuilder

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    Definition Classes
    TreeNode
  39. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any
  40. def getRelevantConstraints(constraints: Set[Expression]): Set[Expression]

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    Attributes
    protected
    Definition Classes
    QueryPlan
  41. def hashCode(): Int

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    Definition Classes
    TreeNode → AnyRef → Any
  42. def initializeLogIfNecessary(isInterpreter: Boolean): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  43. def innerChildren: Seq[QueryPlan[_]]

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    Attributes
    protected
    Definition Classes
    QueryPlan → TreeNode
  44. def inputSet: AttributeSet

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    Definition Classes
    QueryPlan
  45. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any
  46. def isTraceEnabled(): Boolean

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    Attributes
    protected
    Definition Classes
    Logging
  47. def jsonFields: List[JField]

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    Attributes
    protected
    Definition Classes
    TreeNode
  48. def log: Logger

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    Attributes
    protected
    Definition Classes
    Logging
  49. def logDebug(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  50. def logDebug(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  51. def logError(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  52. def logError(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  53. def logInfo(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  54. def logInfo(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  55. def logName: String

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    Attributes
    protected
    Definition Classes
    Logging
  56. def logTrace(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  57. def logTrace(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  58. def logWarning(msg: ⇒ String, throwable: Throwable): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  59. def logWarning(msg: ⇒ String): Unit

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    Attributes
    protected
    Definition Classes
    Logging
  60. def longMetric(name: String): SQLMetric

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    Return a LongSQLMetric according to the name.

    Return a LongSQLMetric according to the name.

    Definition Classes
    SparkPlan
  61. def makeCopy(newArgs: Array[AnyRef]): SparkPlan

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    Overridden make copy also propagates sqlContext to copied plan.

    Overridden make copy also propagates sqlContext to copied plan.

    Definition Classes
    SparkPlan → TreeNode
  62. def map[A](f: (SparkPlan) ⇒ A): Seq[A]

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    Definition Classes
    TreeNode
  63. def mapChildren(f: (SparkPlan) ⇒ SparkPlan): SparkPlan

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    Definition Classes
    TreeNode
  64. def mapExpressions(f: (Expression) ⇒ Expression): CoalesceExec.this.type

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    Definition Classes
    QueryPlan
  65. def mapProductIterator[B](f: (Any) ⇒ B)(implicit arg0: ClassTag[B]): Array[B]

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    Attributes
    protected
    Definition Classes
    TreeNode
  66. def metadata: Map[String, String]

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    Return all metadata that describes more details of this SparkPlan.

    Return all metadata that describes more details of this SparkPlan.

    Definition Classes
    SparkPlan
  67. def metrics: Map[String, SQLMetric]

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    Return all metrics containing metrics of this SparkPlan.

    Return all metrics containing metrics of this SparkPlan.

    Definition Classes
    SparkPlan
  68. def missingInput: AttributeSet

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    Definition Classes
    QueryPlan
  69. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef
  70. def newMutableProjection(expressions: Seq[Expression], inputSchema: Seq[Attribute], useSubexprElimination: Boolean = false): MutableProjection

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    Attributes
    protected
    Definition Classes
    SparkPlan
  71. def newNaturalAscendingOrdering(dataTypes: Seq[DataType]): Ordering[InternalRow]

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    Creates a row ordering for the given schema, in natural ascending order.

    Creates a row ordering for the given schema, in natural ascending order.

    Attributes
    protected
    Definition Classes
    SparkPlan
  72. def newOrdering(order: Seq[SortOrder], inputSchema: Seq[Attribute]): Ordering[InternalRow]

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    Attributes
    protected
    Definition Classes
    SparkPlan
  73. def newPredicate(expression: Expression, inputSchema: Seq[Attribute]): Predicate

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    Attributes
    protected
    Definition Classes
    SparkPlan
  74. def nodeName: String

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    Definition Classes
    TreeNode
  75. final def notify(): Unit

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    Definition Classes
    AnyRef
  76. final def notifyAll(): Unit

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    Definition Classes
    AnyRef
  77. val numPartitions: Int

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  78. def numberedTreeString: String

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    Definition Classes
    TreeNode
  79. val origin: Origin

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    Definition Classes
    TreeNode
  80. def otherCopyArgs: Seq[AnyRef]

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    Attributes
    protected
    Definition Classes
    TreeNode
  81. def output: Seq[Attribute]

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    Definition Classes
    CoalesceExec → QueryPlan
  82. def outputOrdering: Seq[SortOrder]

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    Specifies how data is ordered in each partition.

    Specifies how data is ordered in each partition.

    Definition Classes
    SparkPlan
  83. def outputPartitioning: Partitioning

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    Specifies how data is partitioned across different nodes in the cluster.

    Specifies how data is partitioned across different nodes in the cluster.

    Definition Classes
    CoalesceExecSparkPlan
  84. def outputSet: AttributeSet

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    Definition Classes
    QueryPlan
  85. def p(number: Int): SparkPlan

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    Definition Classes
    TreeNode
  86. final def prepare(): Unit

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    Prepare a SparkPlan for execution.

    Prepare a SparkPlan for execution. It's idempotent.

    Definition Classes
    SparkPlan
  87. def prepareSubqueries(): Unit

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    Finds scalar subquery expressions in this plan node and starts evaluating them.

    Finds scalar subquery expressions in this plan node and starts evaluating them.

    Attributes
    protected
    Definition Classes
    SparkPlan
  88. def prettyJson: String

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    Definition Classes
    TreeNode
  89. def printSchema(): Unit

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    Definition Classes
    QueryPlan
  90. def producedAttributes: AttributeSet

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    Definition Classes
    QueryPlan
  91. def references: AttributeSet

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    Definition Classes
    QueryPlan
  92. def requiredChildDistribution: Seq[Distribution]

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    Specifies any partition requirements on the input data for this operator.

    Specifies any partition requirements on the input data for this operator.

    Definition Classes
    SparkPlan
  93. def requiredChildOrdering: Seq[Seq[SortOrder]]

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    Specifies sort order for each partition requirements on the input data for this operator.

    Specifies sort order for each partition requirements on the input data for this operator.

    Definition Classes
    SparkPlan
  94. def resetMetrics(): Unit

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    Reset all the metrics.

    Reset all the metrics.

    Definition Classes
    SparkPlan
  95. def sameResult(plan: SparkPlan): Boolean

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    Definition Classes
    QueryPlan
  96. lazy val schema: StructType

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    Definition Classes
    QueryPlan
  97. def schemaString: String

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    Definition Classes
    QueryPlan
  98. def simpleString: String

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    Definition Classes
    QueryPlan → TreeNode
  99. def sparkContext: SparkContext

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    Attributes
    protected
    Definition Classes
    SparkPlan
  100. final val sqlContext: SQLContext

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    A handle to the SQL Context that was used to create this plan.

    A handle to the SQL Context that was used to create this plan. Since many operators need access to the sqlContext for RDD operations or configuration this field is automatically populated by the query planning infrastructure.

    Definition Classes
    SparkPlan
  101. def statePrefix: String

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    Attributes
    protected
    Definition Classes
    QueryPlan
  102. def stringArgs: Iterator[Any]

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    Attributes
    protected
    Definition Classes
    TreeNode
  103. val subexpressionEliminationEnabled: Boolean

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    Definition Classes
    SparkPlan
  104. def subqueries: Seq[SparkPlan]

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    Definition Classes
    QueryPlan
  105. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef
  106. def toJSON: String

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    Definition Classes
    TreeNode
  107. def toString(): String

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    Definition Classes
    TreeNode → AnyRef → Any
  108. def transform(rule: PartialFunction[SparkPlan, SparkPlan]): SparkPlan

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    Definition Classes
    TreeNode
  109. def transformAllExpressions(rule: PartialFunction[Expression, Expression]): CoalesceExec.this.type

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    Definition Classes
    QueryPlan
  110. def transformDown(rule: PartialFunction[SparkPlan, SparkPlan]): SparkPlan

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    Definition Classes
    TreeNode
  111. def transformExpressions(rule: PartialFunction[Expression, Expression]): CoalesceExec.this.type

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    Definition Classes
    QueryPlan
  112. def transformExpressionsDown(rule: PartialFunction[Expression, Expression]): CoalesceExec.this.type

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    Definition Classes
    QueryPlan
  113. def transformExpressionsUp(rule: PartialFunction[Expression, Expression]): CoalesceExec.this.type

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    Definition Classes
    QueryPlan
  114. def transformUp(rule: PartialFunction[SparkPlan, SparkPlan]): SparkPlan

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    Definition Classes
    TreeNode
  115. def treeString(verbose: Boolean): String

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    Definition Classes
    TreeNode
  116. def treeString: String

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    Definition Classes
    TreeNode
  117. def validConstraints: Set[Expression]

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    Attributes
    protected
    Definition Classes
    QueryPlan
  118. def verboseString: String

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    Definition Classes
    QueryPlan → TreeNode
  119. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  120. final def wait(arg0: Long, arg1: Int): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  121. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  122. def waitForSubqueries(): Unit

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    Blocks the thread until all subqueries finish evaluation and update the results.

    Blocks the thread until all subqueries finish evaluation and update the results.

    Attributes
    protected
    Definition Classes
    SparkPlan
  123. def withNewChildren(newChildren: Seq[SparkPlan]): SparkPlan

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    Definition Classes
    TreeNode

Inherited from UnaryExecNode

Inherited from SparkPlan

Inherited from Serializable

Inherited from Serializable

Inherited from Logging

Inherited from QueryPlan[SparkPlan]

Inherited from TreeNode[SparkPlan]

Inherited from Product

Inherited from Equals

Inherited from AnyRef

Inherited from Any

Ungrouped