hadoop ProfilerDisabledServlet 源码
haddop ProfilerDisabledServlet 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/ProfilerDisabledServlet.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 java.io.IOException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* Servlet for disabled async-profiler.
*/
@InterfaceAudience.Private
public class ProfilerDisabledServlet extends HttpServlet {
@Override
protected void doGet(final HttpServletRequest req, final HttpServletResponse resp)
throws IOException {
resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
ProfileServlet.setResponseHeader(resp);
// TODO : Replace github.com link with
// https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/
// AsyncProfilerServlet.html once Async profiler changes are released
// in 3.x (3.4.0 as of today).
resp.getWriter().write("The profiler servlet was disabled at startup.\n\n"
+ "Please ensure the prerequisites for the Profiler Servlet have been installed and the\n"
+ "environment is properly configured. \n\n"
+ "For more details, please refer to: https://github.com/apache/hadoop/blob/trunk/"
+ "hadoop-common-project/hadoop-common/src/site/markdown/AsyncProfilerServlet.md");
}
}
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