org.apache.drill.exec.store.schedule

Class AssignmentCreator<T extends CompleteWork>

java.lang.Object

org.apache.drill.exec.store.schedule.AssignmentCreator<T>

public class AssignmentCreator<T extends CompleteWork>
extends Object

The AssignmentCreator is responsible for assigning a set of work units to the available slices.

Method Summary

Methods

Modifier and Type	Method and Description
static <T extends CompleteWork> com.google.common.collect.ListMultimap<Integer,T>	getMappings(List<CoordinationProtos.DrillbitEndpoint> incomingEndpoints, List<T> units) Assign each unit of work to a minor fragment, given that a list of DrillbitEndpoints, whose index in the list correspond to the minor fragment id for each fragment.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getMappings

public static <T extends CompleteWork> com.google.common.collect.ListMultimap<Integer,T> getMappings(List<CoordinationProtos.DrillbitEndpoint> incomingEndpoints,
                                                                                     List<T> units)

Assign each unit of work to a minor fragment, given that a list of DrillbitEndpoints, whose index in the list correspond to the minor fragment id for each fragment. A given DrillbitEndpoint can appear multiple times in this list. This method will try to assign work based on the affinity of each work unit, but will also evenly distribute the work units among all of the minor fragments

Parameters:

incomingEndpoints - The list of incomingEndpoints, indexed by minor fragment id

units - the list of work units to be assigned

Returns:

A multimap that maps each minor fragment id to a list of work units