org.apache.storm.scheduler

Class DefaultScheduler

java.lang.Object

org.apache.storm.scheduler.DefaultScheduler

All Implemented Interfaces:

INodeAssignmentSentCallBack, IScheduler

public class DefaultScheduler
extends Object
implements IScheduler

Constructor Summary

Constructors

Constructor and Description
DefaultScheduler()

Method Summary

Modifier and Type	Method and Description
Map<String,Map<String,Double>>	config() This function returns the scheduler’s configuration.
static void	defaultSchedule(Topologies topologies, Cluster cluster)
void	prepare(Map<String,Object> conf, StormMetricsRegistry metricsRegistry)
void	schedule(Topologies topologies, Cluster cluster) Set assignments for the topologies which needs scheduling.
static Set<WorkerSlot>	slotsCanReassign(Cluster cluster, Set<WorkerSlot> slots)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.storm.scheduler.IScheduler

cleanup

Methods inherited from interface org.apache.storm.scheduler.INodeAssignmentSentCallBack

nodeAssignmentSent

Constructor Detail

DefaultScheduler

public DefaultScheduler()

Method Detail

slotsCanReassign

public static Set<WorkerSlot> slotsCanReassign(Cluster cluster,
                                               Set<WorkerSlot> slots)

defaultSchedule

public static void defaultSchedule(Topologies topologies,
                                   Cluster cluster)

prepare

public void prepare(Map<String,Object> conf,
                    StormMetricsRegistry metricsRegistry)

Specified by:

prepare in interface IScheduler

schedule

public void schedule(Topologies topologies,
                     Cluster cluster)

Description copied from interface: IScheduler

Set assignments for the topologies which needs scheduling. The new assignments is available through cluster.getAssignments()

Specified by:

schedule in interface IScheduler

Parameters:

topologies - all the topologies in the cluster, some of them need schedule. Topologies object here only contain static information about topologies. Information like assignments, slots are all in the cluster object.

cluster - the cluster these topologies are running in. cluster contains everything user need to develop a new scheduling logic. e.g. supervisors information, available slots, current assignments for all the topologies etc. User can set the new assignment for topologies using cluster.setAssignmentById()`

config

public Map<String,Map<String,Double>> config()

Description copied from interface: IScheduler

This function returns the scheduler’s configuration.

Specified by:

config in interface IScheduler

Returns:

The scheduler’s configuration.