org.apache.hadoop.hbase.metrics.impl

Class GlobalMetricRegistriesAdapter

java.lang.Object

org.apache.hadoop.hbase.metrics.impl.GlobalMetricRegistriesAdapter

@InterfaceAudience.Private
public final class GlobalMetricRegistriesAdapter
extends Object

This class acts as an adapter to export the MetricRegistry's in the global registry. Each MetricRegistry will be registered or unregistered from the metric2 system. The collection will be performed via the MetricsSourceAdapter and the MetricRegistry will collected like a BaseSource instance for a group of metrics (like WAL, RPC, etc) with the MetricRegistryInfo's JMX context.

Developer note: Unlike the current metrics2 based approach, the new metrics approach (hbase-metrics-api and hbase-metrics modules) work by having different MetricRegistries that are initialized and used from the code that lives in their respective modules (hbase-server, etc). There is no need to define BaseSource classes and do a lot of indirection. The MetricRegistry'es will be in the global MetricRegistriesImpl, and this class will iterate over MetricRegistries.global() and register adapters to the metrics2 subsystem. These adapters then report the actual values by delegating to HBaseMetrics2HadoopMetricsAdapter.snapshotAllMetrics(MetricRegistry, MetricsCollector). We do not initialize the Hadoop Metrics2 system assuming that other BaseSources already do so (see BaseSourceImpl). Once the last BaseSource is moved to the new system, the metric2 initialization should be moved here.

Method Summary

Modifier and Type	Method and Description
static GlobalMetricRegistriesAdapter	init() Make sure that this global MetricSource for hbase-metrics module based metrics are initialized.
void	stop()

Methods inherited from class java.lang.Object

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

Method Detail

init

public static GlobalMetricRegistriesAdapter init()

Make sure that this global MetricSource for hbase-metrics module based metrics are initialized. This should be called only once.

stop

public void stop()