org.apache.flink.runtime.metrics.groups.ComponentMetricGroup Maven / Gradle / Ivy
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* to you under the Apache License, Version 2.0 (the
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*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
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*/
package org.apache.flink.runtime.metrics.groups;
import org.apache.flink.annotation.Internal;
import org.apache.flink.runtime.metrics.MetricRegistry;
/**
* Abstract {@link org.apache.flink.metrics.MetricGroup} for system components (e.g.,
* TaskManager, Job, Task, Operator).
*
* Usually, the scope of metrics is simply the hierarchy of the containing groups. For example
* the Metric {@code "MyMetric"} in group {@code "B"} nested in group {@code "A"} would have a
* fully scoped name of {@code "A.B.MyMetric"}, with {@code "A.B"} being the Metric's scope.
*
*
Component groups, however, have configurable scopes. This allow users to include or exclude
* certain identifiers from the scope. The scope for metrics belonging to the "Task"
* group could for example include the task attempt number (more fine grained identification), or
* exclude it (for continuity of the namespace across failure and recovery).
*
* @param
The type of the parent MetricGroup.
*/
@Internal
public abstract class ComponentMetricGroup
> extends AbstractMetricGroup
{
/**
* Creates a new ComponentMetricGroup.
*
* @param registry registry to register new metrics with
* @param scope the scope of the group
*/
public ComponentMetricGroup(MetricRegistry registry, String[] scope, P parent) {
super(registry, scope, parent);
}
/**
* Closes the component group by removing and closing all metrics and subgroups
* (inherited from {@link AbstractMetricGroup}), plus closing and removing all dedicated
* component subgroups.
*/
@Override
public void close() {
synchronized (this) {
if (!isClosed()) {
// remove all metrics and generic subgroups
super.close();
// remove and close all subcomponent metrics
for (ComponentMetricGroup group : subComponents()) {
group.close();
}
}
}
}
// ------------------------------------------------------------------------
// Component Metric Group Specifics
// ------------------------------------------------------------------------
/**
* Gets all component metric groups that are contained in this component metric group.
*
* @return All component metric groups that are contained in this component metric group.
*/
protected abstract Iterable subComponents();
}