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java.lang.Objectorg.apache.hadoop.metrics.spi.AbstractMetricsContext
org.apache.hadoop.metrics.spi.NullContext
org.apache.hadoop.metrics2 usage.
@Deprecated @InterfaceAudience.Public @InterfaceStability.Evolving public class NullContext
Null metrics context: a metrics context which does nothing. Used as the default context, so that no performance data is emitted if no configuration data is found.
| Nested Class Summary |
|---|
| Nested classes/interfaces inherited from class org.apache.hadoop.metrics.spi.AbstractMetricsContext |
|---|
AbstractMetricsContext.MetricMap, AbstractMetricsContext.TagMap |
| Field Summary |
|---|
| Fields inherited from interface org.apache.hadoop.metrics.MetricsContext |
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DEFAULT_PERIOD |
| Constructor Summary | |
|---|---|
NullContext()
Deprecated. Creates a new instance of NullContext |
|
| Method Summary | |
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protected void |
emitRecord(String contextName,
String recordName,
OutputRecord outRec)
Deprecated. Do-nothing version of emitRecord |
protected void |
remove(MetricsRecordImpl record)
Deprecated. Do-nothing version of remove |
void |
startMonitoring()
Deprecated. Do-nothing version of startMonitoring |
protected void |
update(MetricsRecordImpl record)
Deprecated. Do-nothing version of update |
| Methods inherited from class org.apache.hadoop.metrics.spi.AbstractMetricsContext |
|---|
close, createRecord, flush, getAllRecords, getAttribute, getAttributeTable, getContextFactory, getContextName, getPeriod, init, isMonitoring, newRecord, parseAndSetPeriod, registerUpdater, setPeriod, stopMonitoring, unregisterUpdater |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
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@InterfaceAudience.Private public NullContext()
| Method Detail |
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@InterfaceAudience.Private public void startMonitoring()
startMonitoring in interface MetricsContextstartMonitoring in class AbstractMetricsContext
@InterfaceAudience.Private
protected void emitRecord(String contextName,
String recordName,
OutputRecord outRec)
emitRecord in class AbstractMetricsContext@InterfaceAudience.Private protected void update(MetricsRecordImpl record)
update in class AbstractMetricsContext@InterfaceAudience.Private protected void remove(MetricsRecordImpl record)
remove in class AbstractMetricsContext
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