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TEZ-4347: Add some diagnostic endpoints to TezAM's WebUIService
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104 changes: 104 additions & 0 deletions
104
tez-common/src/main/java/org/apache/tez/common/web/AbstractServletToControllerAdapter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,104 @@ | ||
| /** | ||
| * 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.tez.common.web; | ||
|
|
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| import java.lang.reflect.InvocationTargetException; | ||
| import java.lang.reflect.Method; | ||
| import java.util.Enumeration; | ||
| import java.util.concurrent.atomic.AtomicBoolean; | ||
|
|
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| import javax.servlet.ServletConfig; | ||
| import javax.servlet.ServletContext; | ||
| import javax.servlet.ServletException; | ||
| import javax.servlet.http.HttpServlet; | ||
| import javax.servlet.http.HttpServletRequest; | ||
| import javax.servlet.http.HttpServletResponse; | ||
|
|
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| import org.apache.hadoop.yarn.webapp.Controller; | ||
|
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| /** | ||
| * AbstractServletToControllerAdapter is a common ancestor for classes | ||
| * that wish to adapt servlets to yarn webapp controllers. | ||
| * The adapter is responsible for: | ||
| * 1. creating a servlet instance | ||
| * 2. creating a dummy ServletConfig | ||
| * 3. delegating calls to the servlet instance's doGet method | ||
| */ | ||
| public abstract class AbstractServletToControllerAdapter extends Controller { | ||
| private AtomicBoolean initialized = new AtomicBoolean(false); | ||
| protected HttpServlet servlet; | ||
|
|
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| @Override | ||
| public void index() { | ||
| if (initialized.compareAndSet(false, true)) { | ||
| initServlet(); | ||
| } | ||
| try { | ||
| /* | ||
| * This reflection workaround is needed because HttpServlet.doGet is protected | ||
| * (even if subclasses have it public). | ||
| */ | ||
| Method doGetMethod = | ||
| this.servlet.getClass().getMethod("doGet", HttpServletRequest.class, HttpServletResponse.class); | ||
| doGetMethod.setAccessible(true); | ||
| doGetMethod.invoke(this.servlet, request(), response()); | ||
| } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException | NoSuchMethodException | ||
| | SecurityException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
|
|
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| /** | ||
| * Creates a dummy servlet config which is suitable for initializing a servlet instance. | ||
| * @param servletName | ||
| * @return a ServletConfig instance initialized with a ServletContext | ||
| */ | ||
| private ServletConfig getDummyServletConfig(String servletName) { | ||
| return new ServletConfig() { | ||
|
|
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| @Override | ||
| public String getServletName() { | ||
| return servletName; | ||
| } | ||
|
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| @Override | ||
| public ServletContext getServletContext() { | ||
| return request().getServletContext(); | ||
| } | ||
|
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| @Override | ||
| public Enumeration<String> getInitParameterNames() { | ||
| return null; | ||
| } | ||
|
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| @Override | ||
| public String getInitParameter(String name) { | ||
| return null; | ||
| } | ||
| }; | ||
| } | ||
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| private void initServlet() { | ||
| try { | ||
| servlet.init(getDummyServletConfig(this.servlet.getClass().getSimpleName())); | ||
| } catch (ServletException e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
| } |
45 changes: 45 additions & 0 deletions
45
tez-common/src/main/java/org/apache/tez/common/web/ServletToControllerAdapters.java
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|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| /** | ||
| * 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. | ||
| */ | ||
|
|
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| package org.apache.tez.common.web; | ||
|
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| import javax.servlet.ServletException; | ||
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| import org.apache.hadoop.conf.ConfServlet; | ||
| import org.apache.hadoop.http.HttpServer2.StackServlet; | ||
| import org.apache.hadoop.jmx.JMXJsonServlet; | ||
|
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| public class ServletToControllerAdapters { | ||
| public static class JMXJsonServletController extends AbstractServletToControllerAdapter { | ||
| public JMXJsonServletController() throws ServletException { | ||
| this.servlet = new JMXJsonServlet(); | ||
| } | ||
| } | ||
|
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| public static class ConfServletController extends AbstractServletToControllerAdapter { | ||
| public ConfServletController() throws ServletException { | ||
| this.servlet = new ConfServlet(); | ||
| } | ||
| } | ||
|
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| public static class StackServletController extends AbstractServletToControllerAdapter { | ||
| public StackServletController() throws ServletException { | ||
| this.servlet = new StackServlet(); | ||
| } | ||
| } | ||
| } |
22 changes: 22 additions & 0 deletions
22
tez-common/src/main/java/org/apache/tez/common/web/package-info.java
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|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| /** | ||
| * 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. | ||
| */ | ||
|
|
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| @Private | ||
| package org.apache.tez.common.web; | ||
|
|
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| import org.apache.hadoop.classification.InterfaceAudience.Private; |
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