org.apache.storm.scheduler.resource.strategies.scheduling.sorter

Class ExecSorterByConnectionCount

java.lang.Object

org.apache.storm.scheduler.resource.strategies.scheduling.sorter.ExecSorterByConnectionCount

All Implemented Interfaces:

IExecSorter

public class ExecSorterByConnectionCount
extends Object
implements IExecSorter

Field Summary

Fields

Modifier and Type	Field and Description
protected TopologyDetails	topologyDetails

Constructor Summary

Constructors

Constructor and Description
ExecSorterByConnectionCount(TopologyDetails topologyDetails)

Method Summary

Modifier and Type	Method and Description
List<ExecutorDetails>	sortExecutors(Set<ExecutorDetails> unassignedExecutors) Order executors based on how many in and out connections it will potentially need to make, in descending order.

Methods inherited from class java.lang.Object

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

Field Detail

topologyDetails

protected TopologyDetails topologyDetails

Constructor Detail

ExecSorterByConnectionCount

public ExecSorterByConnectionCount(TopologyDetails topologyDetails)

Method Detail

sortExecutors

public List<ExecutorDetails> sortExecutors(Set<ExecutorDetails> unassignedExecutors)

Order executors based on how many in and out connections it will potentially need to make, in descending order. First order components by the number of in and out connections it will have. Then iterate through the sorted list of components. For each component sort the neighbors of that component by how many connections it will have to make with that component. Add an executor from this component and then from each neighboring component in sorted order. Do this until there is nothing left to schedule. Then add back executors not accounted for - which are system executors.

Specified by:

sortExecutors in interface IExecSorter

Parameters:

unassignedExecutors - an unmodifiable set of executors that need to be scheduled.

Returns:

a list of executors in sorted order for scheduling.