com.bigdata.rdf.sail.webapp.lbs.policy.counters

Class DefaultHostScoringRule

java.lang.Object

com.bigdata.rdf.sail.webapp.lbs.policy.counters.DefaultHostScoringRule

All Implemented Interfaces:

IHostScoringRule

public class DefaultHostScoringRule
extends Object
implements IHostScoringRule

Best effort computation of a workload score based on CPU Utilization and IO Wait defined as follows:

 (1d + cpu_wio * 100d) / (1d + cpu_idle)
 

Note: Not all platforms report all metrics. For example, OSX does not report IO Wait, which is a key metric for the workload of a database. If a metric is not available for a host, then a fallback value is used.

Author:

Bryan Thompson FIXME GC time is a per-JVM metric that should be incorporated into our default scoring strartegy. It will only get reported by the ganglia plug in if it is setup to self-report that data. And it may not report it correctly if there is more than one HAJournalService per host. It is also available from the /bigdata/counters and could be exposed as a JMX MBean.

Constructor Summary

Constructors

Constructor and Description
DefaultHostScoringRule()

Method Summary

Methods

Modifier and Type	Method and Description
String[]	getMetricNames() Return the set of metric names that are used by this scoring rule.
double	getScore(IHostMetrics metrics) Return a score for the given IHostMetrics.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultHostScoringRule

public DefaultHostScoringRule()

Method Detail

getMetricNames

public String[] getMetricNames()

Description copied from interface: IHostScoringRule

Return the set of metric names that are used by this scoring rule.

Specified by:

getMetricNames in interface IHostScoringRule

getScore

public double getScore(IHostMetrics metrics)

Description copied from interface: IHostScoringRule

Return a score for the given IHostMetrics.

Specified by:

getScore in interface IHostScoringRule

Parameters:

metrics - The IHostMetrics.

Returns:

The score.