Package org.apache.drill.exec.planner.fragment

Interface Summary

Interface	Description
FragmentParallelizer	Generic interface to provide different parallelization strategies for MajorFragments.
FragmentVisitor<T,V>
ParallelizationParameters	Interface to implement for passing parameters to FragmentParallelizer.

Class Summary

Class	Description
Fragment
HardAffinityFragmentParallelizer	Implementation of FragmentParallelizer where fragment requires running on a given set of endpoints.
MakeFragmentsVisitor	Responsible for breaking a plan into its constituent Fragments.
Materializer
Materializer.IndexedFragmentNode
ParallelizationInfo	Captures parallelization parameters for a given operator/fragments.
ParallelizationInfo.ParallelizationInfoCollector	Collects/merges one or more ParallelizationInfo instances.
PlanningSet
SimpleParallelizer	The simple parallelizer determines the level of parallelization of a plan based on the cost of the underlying operations.
SimpleParallelizer.CountRequiredFragments	Designed to setup initial values for arriving fragment accounting.
SoftAffinityFragmentParallelizer	Implementation of FragmentParallelizer where fragment has zero or more endpoints with affinities.
Stats
StatsCollector	Visitor to collect stats such as cost and parallelization info of operators within a fragment.
Wrapper	A wrapping class that allows us to add additional information to each fragment node for planning purposes.

Enum Summary

Enum	Description
DistributionAffinity	Describes an operator's endpoint assignment requirements.