Java tutorial
/** * 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.server.webapp; import static org.apache.hadoop.yarn.util.StringHelper.join; import static org.apache.hadoop.yarn.webapp.YarnWebParams.APPLICATION_ATTEMPT_ID; import java.security.PrivilegedExceptionAction; import java.util.Collection; import org.apache.commons.lang.StringEscapeUtils; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.hadoop.security.UserGroupInformation; import org.apache.hadoop.yarn.api.ApplicationBaseProtocol; import org.apache.hadoop.yarn.api.protocolrecords.GetApplicationAttemptReportRequest; import org.apache.hadoop.yarn.api.protocolrecords.GetContainersRequest; import org.apache.hadoop.yarn.api.records.ApplicationAttemptId; import org.apache.hadoop.yarn.api.records.ApplicationAttemptReport; import org.apache.hadoop.yarn.api.records.ContainerId; import org.apache.hadoop.yarn.api.records.ContainerReport; import org.apache.hadoop.yarn.api.records.YarnApplicationAttemptState; import org.apache.hadoop.yarn.server.webapp.dao.AppAttemptInfo; import org.apache.hadoop.yarn.server.webapp.dao.ContainerInfo; import org.apache.hadoop.yarn.util.ConverterUtils; import org.apache.hadoop.yarn.webapp.hamlet.Hamlet; import org.apache.hadoop.yarn.webapp.hamlet.Hamlet.TABLE; import org.apache.hadoop.yarn.webapp.hamlet.Hamlet.TBODY; import org.apache.hadoop.yarn.webapp.view.HtmlBlock; import org.apache.hadoop.yarn.webapp.view.InfoBlock; import com.google.inject.Inject; public class AppAttemptBlock extends HtmlBlock { private static final Log LOG = LogFactory.getLog(AppAttemptBlock.class); protected ApplicationBaseProtocol appBaseProt; protected ApplicationAttemptId appAttemptId = null; @Inject public AppAttemptBlock(ApplicationBaseProtocol appBaseProt, ViewContext ctx) { super(ctx); this.appBaseProt = appBaseProt; } @Override protected void render(Block html) { String attemptid = $(APPLICATION_ATTEMPT_ID); if (attemptid.isEmpty()) { puts("Bad request: requires application attempt ID"); return; } try { appAttemptId = ApplicationAttemptId.fromString(attemptid); } catch (IllegalArgumentException e) { puts("Invalid application attempt ID: " + attemptid); return; } UserGroupInformation callerUGI = getCallerUGI(); ApplicationAttemptReport appAttemptReport; try { final GetApplicationAttemptReportRequest request = GetApplicationAttemptReportRequest .newInstance(appAttemptId); if (callerUGI == null) { appAttemptReport = appBaseProt.getApplicationAttemptReport(request).getApplicationAttemptReport(); } else { appAttemptReport = callerUGI.doAs(new PrivilegedExceptionAction<ApplicationAttemptReport>() { @Override public ApplicationAttemptReport run() throws Exception { return appBaseProt.getApplicationAttemptReport(request).getApplicationAttemptReport(); } }); } } catch (Exception e) { String message = "Failed to read the application attempt " + appAttemptId + "."; LOG.error(message, e); html.p()._(message)._(); return; } if (appAttemptReport == null) { puts("Application Attempt not found: " + attemptid); return; } boolean exceptionWhenGetContainerReports = false; Collection<ContainerReport> containers = null; try { final GetContainersRequest request = GetContainersRequest.newInstance(appAttemptId); if (callerUGI == null) { containers = appBaseProt.getContainers(request).getContainerList(); } else { containers = callerUGI.doAs(new PrivilegedExceptionAction<Collection<ContainerReport>>() { @Override public Collection<ContainerReport> run() throws Exception { return appBaseProt.getContainers(request).getContainerList(); } }); } } catch (RuntimeException e) { // have this block to suppress the findbugs warning exceptionWhenGetContainerReports = true; } catch (Exception e) { exceptionWhenGetContainerReports = true; } AppAttemptInfo appAttempt = new AppAttemptInfo(appAttemptReport); setTitle(join("Application Attempt ", attemptid)); String node = "N/A"; if (appAttempt.getHost() != null && appAttempt.getRpcPort() >= 0 && appAttempt.getRpcPort() < 65536) { node = appAttempt.getHost() + ":" + appAttempt.getRpcPort(); } generateOverview(appAttemptReport, containers, appAttempt, node); if (exceptionWhenGetContainerReports) { html.p()._("Sorry, Failed to get containers for application attempt" + attemptid + ".")._(); return; } createAttemptHeadRoomTable(html); html._(InfoBlock.class); createTablesForAttemptMetrics(html); // Container Table TBODY<TABLE<Hamlet>> tbody = html.table("#containers").thead().tr().th(".id", "Container ID") .th(".node", "Node").th(".exitstatus", "Container Exit Status").th(".logs", "Logs")._()._().tbody(); StringBuilder containersTableData = new StringBuilder("[\n"); for (ContainerReport containerReport : containers) { ContainerInfo container = new ContainerInfo(containerReport); containersTableData.append("[\"<a href='").append(url("container", container.getContainerId())) .append("'>").append(container.getContainerId()).append("</a>\",\"<a ") .append(container.getNodeHttpAddress() == null ? "#" : "href='" + container.getNodeHttpAddress()) .append("'>") .append(container.getNodeHttpAddress() == null ? "N/A" : StringEscapeUtils .escapeJavaScript(StringEscapeUtils.escapeHtml(container.getNodeHttpAddress()))) .append("</a>\",\"").append(container.getContainerExitStatus()).append("\",\"<a href='") .append(container.getLogUrl() == null ? "#" : container.getLogUrl()).append("'>") .append(container.getLogUrl() == null ? "N/A" : "Logs").append("</a>\"],\n"); } if (containersTableData.charAt(containersTableData.length() - 2) == ',') { containersTableData.delete(containersTableData.length() - 2, containersTableData.length() - 1); } containersTableData.append("]"); html.script().$type("text/javascript")._("var containersTableData=" + containersTableData)._(); tbody._()._(); } protected void generateOverview(ApplicationAttemptReport appAttemptReport, Collection<ContainerReport> containers, AppAttemptInfo appAttempt, String node) { String amContainerId = appAttempt.getAmContainerId(); info("Application Attempt Overview") ._("Application Attempt State:", appAttempt.getAppAttemptState() == null ? UNAVAILABLE : appAttempt.getAppAttemptState()) ._("AM Container:", amContainerId == null || containers == null || !hasAMContainer(appAttemptReport.getAMContainerId(), containers) ? null : root_url("container", amContainerId), amContainerId == null ? "N/A" : amContainerId) ._("Node:", node) ._("Tracking URL:", appAttempt.getTrackingUrl() == null || appAttempt.getTrackingUrl().equals(UNAVAILABLE) ? null : root_url(appAttempt.getTrackingUrl()), appAttempt.getTrackingUrl() == null || appAttempt.getTrackingUrl().equals(UNAVAILABLE) ? "Unassigned" : appAttempt.getAppAttemptState() == YarnApplicationAttemptState.FINISHED || appAttempt.getAppAttemptState() == YarnApplicationAttemptState.FAILED || appAttempt.getAppAttemptState() == YarnApplicationAttemptState.KILLED ? "History" : "ApplicationMaster") ._("Diagnostics Info:", appAttempt.getDiagnosticsInfo() == null ? "" : appAttempt.getDiagnosticsInfo()); } protected boolean hasAMContainer(ContainerId containerId, Collection<ContainerReport> containers) { for (ContainerReport container : containers) { if (containerId.equals(container.getContainerId())) { return true; } } return false; } protected void createAttemptHeadRoomTable(Block html) { } protected void createTablesForAttemptMetrics(Block html) { } }