com.hazelcast.internal.monitors

Class HealthMonitor

java.lang.Object

java.lang.Thread

com.hazelcast.internal.monitors.HealthMonitor

All Implemented Interfaces:

Runnable

public class HealthMonitor
extends Thread

http://blog.scoutapp.com/articles/2009/07/31/understanding-load-averages http://docs.oracle.com/javase/7/docs/jre/api/management/extension/com/sun/management/OperatingSystemMXBean.html

Health monitor periodically prints logs about related internal metrics under when hazelcast is under load. Under load means that memory usage is above threshold percentage or process/cpu load is above threshold.

Health monitor can be configured with system properties

"hazelcast.health.monitoring.level" This property can be one of the following NOISY => does not check threshold , always prints. SILENT(default) => prints only if metrics are above threshold. OFF => Does not print anything.

"hazelcast.health.monitoring.delay.seconds" Time between printing two logs of health monitor. Default values is 30 seconds

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

Thread.State, Thread.UncaughtExceptionHandler

Field Summary

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors

Constructor and Description
HealthMonitor(HazelcastInstanceImpl hazelcastInstance, HealthMonitorLevel logLevel, int delaySeconds)

Method Summary

Methods

Modifier and Type	Method and Description
static String	numberToUnit(long number)
static String	percentageString(double p) Given a number, returns that number as a percentage string.
void	run()

Methods inherited from class java.lang.Thread

activeCount, checkAccess, clone, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Constructor Detail

HealthMonitor

public HealthMonitor(HazelcastInstanceImpl hazelcastInstance,
             HealthMonitorLevel logLevel,
             int delaySeconds)

Method Detail

run

public void run()

Specified by:

run in interface Runnable

Overrides:

run in class Thread

percentageString

public static String percentageString(double p)

Given a number, returns that number as a percentage string.

Parameters:

p - the given number

Returns:

a string of the given number as a format float with two decimal places and a period

numberToUnit

public static String numberToUnit(long number)