JvmPauseMonitor (Apache HBase 1.4.11 API)

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java.lang.Object
- org.apache.hadoop.hbase.util.JvmPauseMonitor

```
@InterfaceAudience.Private
public class JvmPauseMonitor
extends Object
```
Class which sets up a simple thread which runs in a loop sleeping for a short interval of time. If the sleep takes significantly longer than its target time, it implies that the JVM or host machine has paused processing, which may cause other problems. If such a pause is detected, the thread logs a message. The original JvmPauseMonitor is: ${hadoop-common-project}/hadoop-common/src/main/java/org/apache/hadoop/util/ JvmPauseMonitor.java r1503806 | cmccabe | 2013-07-17 01:48:24 +0800 (Wed, 17 Jul 2013) | 1 line HADOOP-9618. thread which detects GC pauses(Todd Lipcon)

Field Summary

Fields
Modifier and Type Field and Description

static String INFO_THRESHOLD_KEY

static String WARN_THRESHOLD_KEY

Constructor Summary

Constructors
Constructor and Description
`JvmPauseMonitor(org.apache.hadoop.conf.Configuration conf)`
`JvmPauseMonitor(org.apache.hadoop.conf.Configuration conf, JvmPauseMonitorSource metricsSource)`

Method Summary

Methods
Modifier and Type	Method and Description
`JvmPauseMonitorSource`	`getMetricsSource()`
`static void`	`main(String[] args)` Simple 'main' to facilitate manual testing of the pause monitor.
`void`	`setMetricsSource(JvmPauseMonitorSource metricsSource)`
`void`	`start()`
`void`	`stop()`
`void`	`updateMetrics(long sleepTime, boolean gcDetected)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail
- WARN_THRESHOLD_KEY
```
public static final String WARN_THRESHOLD_KEY
```
  See Also:
  Constant Field Values
- INFO_THRESHOLD_KEY
```
public static final String INFO_THRESHOLD_KEY
```
  See Also:
  Constant Field Values

Constructor Detail

JvmPauseMonitor

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

JvmPauseMonitor

public JvmPauseMonitor(org.apache.hadoop.conf.Configuration conf,
               JvmPauseMonitorSource metricsSource)

Method Detail
- start
```
public void start()
```
- stop
```
public void stop()
```
- updateMetrics
```
public void updateMetrics(long sleepTime,
                 boolean gcDetected)
```
- getMetricsSource
```
public JvmPauseMonitorSource getMetricsSource()
```
- setMetricsSource
```
public void setMetricsSource(JvmPauseMonitorSource metricsSource)
```
- 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

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