org.apache.cassandra.scheduler

Class RoundRobinScheduler

java.lang.Object

org.apache.cassandra.scheduler.RoundRobinScheduler

All Implemented Interfaces:

IRequestScheduler

public class RoundRobinScheduler
extends java.lang.Object
implements IRequestScheduler

A very basic Round Robin implementation of the RequestScheduler. It handles request groups identified on user/keyspace by placing them in separate queues and servicing a request from each queue in a RoundRobin fashion. It optionally adds weights for each round.

Constructor Summary

Constructors

Constructor and Description
RoundRobinScheduler(RequestSchedulerOptions options)

Method Summary

Modifier and Type	Method and Description
void	queue(java.lang.Thread t, java.lang.String id, long timeoutMS) Queue incoming request threads
void	release() A convenience method for indicating when a particular request has completed processing, and before a return to the client

Methods inherited from class java.lang.Object

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

Constructor Detail

RoundRobinScheduler

public RoundRobinScheduler(RequestSchedulerOptions options)

Method Detail

queue

public void queue(java.lang.Thread t,
                  java.lang.String id,
                  long timeoutMS)
           throws java.util.concurrent.TimeoutException

Description copied from interface: IRequestScheduler

Queue incoming request threads

Specified by:

queue in interface IRequestScheduler

Parameters:

t - Thread handing the request

id - Scheduling parameter, an id to distinguish profiles (users/keyspace)

timeoutMS - The max time in milliseconds to spend blocking for a slot

Throws:

java.util.concurrent.TimeoutException

release

public void release()

Description copied from interface: IRequestScheduler

A convenience method for indicating when a particular request has completed processing, and before a return to the client

Specified by:

release in interface IRequestScheduler