hadoop PrometheusServlet 源码
haddop PrometheusServlet 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/PrometheusServlet.java
/**
* 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.http;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import org.apache.hadoop.metrics2.lib.DefaultMetricsSystem;
import org.apache.hadoop.metrics2.sink.PrometheusMetricsSink;
/**
* Servlet to publish hadoop metrics in prometheus format.
*/
public class PrometheusServlet extends HttpServlet {
public PrometheusMetricsSink getPrometheusSink() {
return
(PrometheusMetricsSink) getServletContext().getAttribute(
HttpServer2.PROMETHEUS_SINK);
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
DefaultMetricsSystem.instance().publishMetricsNow();
getPrometheusSink().writeMetrics(resp.getWriter());
resp.getWriter().flush();
}
}
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