alluxio.util

Class JvmPauseMonitor

java.lang.Object

alluxio.util.JvmPauseMonitor

@NotThreadSafe
public class JvmPauseMonitor
extends Object

Class to monitor JVM with a daemon thread, the thread sleep period of time and get the true time the sleep takes. If it is longer than it should be, the JVM has paused processing. Then log it into different level.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	JvmPauseMonitor.GarbageCollectorMXBeanView An unmodifiable view of a garbage collector MX Bean.

Constructor Summary

Constructors

Constructor and Description
JvmPauseMonitor(long gcSleepIntervalMs, long warnThresholdMs, long infoThresholdMs) Constructs JvmPauseMonitor.

Method Summary

Modifier and Type	Method and Description
long	getInfoTimeExceeded()
long	getTotalExtraTime()
long	getWarnTimeExceeded()
boolean	isStarted()
void	start() Starts jvm monitor thread.
void	stop() Stops jvm monitor.

Methods inherited from class java.lang.Object

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

Constructor Detail

JvmPauseMonitor

public JvmPauseMonitor(long gcSleepIntervalMs,
                       long warnThresholdMs,
                       long infoThresholdMs)

Constructs JvmPauseMonitor.

Parameters:

gcSleepIntervalMs - The time in milliseconds to sleep for in checking for GC pauses

warnThresholdMs - when gc pauses exceeds this time in milliseconds log WARN

infoThresholdMs - when gc pauses exceeds this time in milliseconds log INFO

Method Detail

start

public void start()

Starts jvm monitor thread.

stop

public void stop()

Stops jvm monitor.

isStarted

public boolean isStarted()

Returns:

true if thread started, false otherwise

getWarnTimeExceeded

public long getWarnTimeExceeded()

Returns:

time exceeds WARN threshold in milliseconds

getInfoTimeExceeded

public long getInfoTimeExceeded()

Returns:

time exceeds INFO threshold in milliseconds

getTotalExtraTime

public long getTotalExtraTime()

Returns:

Total extra time in milliseconds