Package 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	Description
DefaultScheduler()

Method Summary

Modifier and Type	Method	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.INodeAssignmentSentCallBack

nodeAssignmentSent

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

cleanup

Constructor Details

DefaultScheduler

public DefaultScheduler()

Method Details

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.