org.apache.hadoop.metrics2.sink.PrometheusMetricsSink Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.metrics2.sink;
import org.apache.commons.configuration2.SubsetConfiguration;
import org.apache.hadoop.metrics2.AbstractMetric;
import org.apache.hadoop.metrics2.MetricType;
import org.apache.hadoop.metrics2.MetricsRecord;
import org.apache.hadoop.metrics2.MetricsSink;
import org.apache.hadoop.metrics2.MetricsTag;
import java.io.IOException;
import java.io.Writer;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Pattern;
import org.apache.commons.lang3.StringUtils;
/**
* Metrics sink for prometheus exporter.
*
* Stores the metric data in-memory and return with it on request.
*/
public class PrometheusMetricsSink implements MetricsSink {
/**
* Cached output lines for each metrics.
*/
private final Map metricLines = new ConcurrentHashMap<>();
private static final Pattern SPLIT_PATTERN =
Pattern.compile("(?