org.apache.hadoop.hive.common

Class JvmPauseMonitor

java.lang.Object

org.apache.hadoop.hive.common.JvmPauseMonitor

public class JvmPauseMonitor
extends Object

Based on the JvmPauseMonitor from Hadoop.

Constructor Summary

Constructors

Constructor and Description
JvmPauseMonitor(org.apache.hadoop.conf.Configuration conf)

Method Summary

Modifier and Type	Method and Description
long	getNumGcInfoThresholdExceeded()
long	getNumGcWarnThreadholdExceeded()
long	getTotalGcExtraSleepTime()
boolean	isStarted()
static void	main(String[] args) Simple 'main' to facilitate manual testing of the pause monitor.
void	start()
void	stop()

Methods inherited from class java.lang.Object

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

Constructor Detail

JvmPauseMonitor

public JvmPauseMonitor(org.apache.hadoop.conf.Configuration conf)

Method Detail

start

public void start()

stop

public void stop()

isStarted

public boolean isStarted()

getNumGcWarnThreadholdExceeded

public long getNumGcWarnThreadholdExceeded()

getNumGcInfoThresholdExceeded

public long getNumGcInfoThresholdExceeded()

getTotalGcExtraSleepTime

public long getTotalGcExtraSleepTime()

main

public static void main(String[] args)
                 throws Exception

Simple 'main' to facilitate manual testing of the pause monitor. This main function just leaks memory into a list. Running this class with a 1GB heap will very quickly go into "GC hell" and result in log messages about the GC pauses.

Throws:

Exception