hadoop ErrorPage 源码
haddop ErrorPage 代码
文件路径：/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/webapp/view/ErrorPage.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.yarn.webapp.view;
import java.io.CharArrayWriter;
import java.io.PrintWriter;
import org.apache.hadoop.classification.InterfaceAudience;
/**
* A jquery-ui themeable error page
*/
@InterfaceAudience.LimitedPrivate({"YARN", "MapReduce"})
public class ErrorPage extends HtmlPage {
@Override
protected void render(Page.HTML<__> html) {
set(JQueryUI.ACCORDION_ID, "msg");
String title = "Sorry, got error "+ status();
html.
title(title).
link(root_url("static", "yarn.css")).
__(JQueryUI.class). // an embedded sub-view
style("#msg { margin: 1em auto; width: 88%; }",
"#msg h1 { padding: 0.2em 1.5em; font: bold 1.3em serif; }").
div("#msg").
h1(title).
div().
__("Please consult").
a("http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html",
"RFC 2616").__(" for meanings of the error code.").__().
h1("Error Details").
pre().
__(errorDetails()).__().__().__();
}
protected String errorDetails() {
if (!$(ERROR_DETAILS).isEmpty()) {
return $(ERROR_DETAILS);
}
if (error() != null) {
return toStackTrace(error(), 1024 * 64);
}
return "No exception was thrown.";
}
public static String toStackTrace(Throwable error, int cutoff) {
// default initial size is 32 chars
CharArrayWriter buffer = new CharArrayWriter(8 * 1024);
error.printStackTrace(new PrintWriter(buffer));
return buffer.size() < cutoff ? buffer.toString()
: buffer.toString().substring(0, cutoff);
}
}
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