/**
* 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.mapred;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.hadoop.mapred.FairScheduler.JobInfo;
import org.apache.hadoop.mapred.FairScheduler.JobComparator;
import org.apache.hadoop.util.StringUtils;
/**
* Servlet for displaying fair scheduler information, installed at
* [job tracker URL]/scheduler when the {@link FairScheduler} is in use.
*
* The main features are viewing each job's task count and fair share, ability
* to change job priorities and pools from the UI, and ability to switch the
* scheduler to FIFO mode without restarting the JobTracker if this is required
* for any reason.
*
* There is also an "advanced" view for debugging that can be turned on by
* going to [job tracker URL]/scheduler?advanced.
*/
public class FairSchedulerServlet extends HttpServlet {
private static final long serialVersionUID = 9104070533067306659L;
private static final DateFormat DATE_FORMAT =
new SimpleDateFormat("MMM dd, HH:mm");
// This object obtain the resource utilization information
private FairScheduler scheduler;
private LoadManager loadMgr;
private JobTracker jobTracker;
private static long lastId = 0; // Used to generate unique element IDs
@Override
public void init() throws ServletException {
super.init();
ServletContext servletContext = this.getServletContext();
this.scheduler = (FairScheduler) servletContext.getAttribute("scheduler");
this.jobTracker = (JobTracker) scheduler.taskTrackerManager;
this.loadMgr = scheduler.getLoadManager();
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
doGet(req, resp); // Same handler for both GET and POST
}
@Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// If the request has a set* param, handle that and redirect to the regular
// view page so that the user won't resubmit the data if they hit refresh.
boolean advancedView = request.getParameter("advanced") != null;
if (request.getParameter("setJobComparator") != null) {
String newMode = request.getParameter("setJobComparator");
scheduler.setJobComparator(JobComparator.fromString(newMode));
response.sendRedirect("/scheduler" + (advancedView ? "?advanced" : ""));
return;
}
if (request.getParameter("setPool") != null) {
Collection<JobInProgress> runningJobs = getInitedJobs();
PoolManager poolMgr = null;
synchronized (scheduler) {
poolMgr = scheduler.getPoolManager();
}
String pool = request.getParameter("setPool");
String jobId = request.getParameter("jobid");
for (JobInProgress job: runningJobs) {
if (job.getProfile().getJobID().toString().equals(jobId)) {
synchronized(scheduler){
poolMgr.setPool(job, pool);
scheduler.infos.get(job).poolName = pool;
}
scheduler.update();
break;
}
}
response.sendRedirect("/scheduler" + (advancedView ? "?advanced" : ""));
return;
}
if (request.getParameter("setPriority") != null) {
Collection<JobInProgress> runningJobs = getInitedJobs();
JobPriority priority = JobPriority.valueOf(request.getParameter(
"setPriority"));
String jobId = request.getParameter("jobid");
for (JobInProgress job: runningJobs) {
if (job.getProfile().getJobID().toString().equals(jobId)) {
job.setPriority(priority);
scheduler.update();
break;
}
}
response.sendRedirect("/scheduler" + (advancedView ? "?advanced" : ""));
return;
}
if (request.getParameter("setTtThreshold") != null) {
long newThreshold = Long.parseLong(
request.getParameter("setTtThreshold")) * 1024;
((MemBasedLoadManager)loadMgr).setReservedPhysicalMemoryOnTT(newThreshold);
response.sendRedirect("/scheduler" + (advancedView ? "?advanced" : ""));
return;
}
if (request.getParameter("setLocalityDelayNodeLocal") != null) {
long delay =
Long.parseLong(request.getParameter("setLocalityDelayNodeLocal"));
scheduler.setLocalityDelayNodeLocal(delay);
response.sendRedirect("/scheduler" + (advancedView ? "?advanced" : ""));
return;
}
if (request.getParameter("setLocalityDelayRackLocal") != null) {
long delay =
Long.parseLong(request.getParameter("setLocalityDelayRackLocal"));
scheduler.setLocalityDelayRackLocal(delay);
response.sendRedirect("/scheduler" + (advancedView ? "?advanced" : ""));
return;
}
if (request.getParameter("setMapPerHeartBeat") != null) {
scheduler.setMapPerHeartBeat(
Integer.parseInt(request.getParameter("setMapPerHeartBeat")));
response.sendRedirect("/scheduler" + (advancedView ? "?advanced" : ""));
return;
}
if (request.getParameter("setReducePerHeartBeat") != null) {
scheduler.setReducePerHeartBeat(
Integer.parseInt(request.getParameter("setReducePerHeartBeat")));
response.sendRedirect("/scheduler" + (advancedView ? "?advanced" : ""));
return;
}
if (request.getParameter("setPreemptionEnabled") != null) {
scheduler.setPreemptionEnabled(
"On".equals(request.getParameter("setPreemptionEnabled")) ?
true : false);
}
// Print out the normal response
response.setContentType("text/html");
// Because the client may read arbitrarily slow, and we hold locks while
// the servlet output, we want to write to our own buffer which we know
// won't block.
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintWriter out = new PrintWriter(baos);
String hostname = StringUtils.simpleHostname(
jobTracker.getJobTrackerMachine());
out.print("<html><head>");
out.printf("<title>%s Job Scheduler Admininstration</title>\n", hostname);
out.print("<link rel=\"stylesheet\" type=\"text/css\" " +
"href=\"/static/hadoop.css\">\n");
out.print("</head><body>\n");
out.printf("<h1><a href=\"/jobtracker.jsp\">%s</a> " +
"Job Scheduler Administration</h1>\n", hostname);
showCluster(out, advancedView);
showPools(out, advancedView);
showJobs(out, advancedView);
showAdminFormMemBasedLoadMgr(out, advancedView);
showAdminFormLocalityDelay(out, advancedView);
showNumTaskPerHeartBeatOption(out, advancedView);
showAdminFormJobComparator(out, advancedView);
showAdminFormPreemption(out, advancedView);
out.print("</body></html>\n");
out.close();
// Flush our buffer to the real servlet output
OutputStream servletOut = response.getOutputStream();
baos.writeTo(servletOut);
servletOut.close();
}
/**
* Print a view of pools to the given output writer.
*/
private void showPools(PrintWriter out, boolean advancedView) {
ResourceReporter reporter = jobTracker.getResourceReporter();
synchronized (jobTracker) {
synchronized(scheduler) {
PoolManager poolManager = scheduler.getPoolManager();
out.print("<h2>Active Pools</h2>\n");
out.print("<table border=\"2\" cellpadding=\"5\" cellspacing=\"2\">\n");
out.print("<tr><th>Pool</th><th>Running Jobs</th>" +
"<th>Min Maps</th><th>Min Reduces</th>" +
"<th>Max Maps</th><th>Max Reduces</th>" +
"<th>Running/Waiting Maps</th><th>Running/Waiting Reduces</th>" +
(reporter != null ? "<th>CPU</th><th>Memory</th>" : "") +
"<th>Avg Wait Time(sec)</th></tr>\n");
List<Pool> pools = new ArrayList<Pool>(poolManager.getPools());
Collections.sort(pools, new Comparator<Pool>() {
public int compare(Pool p1, Pool p2) {
if (p1.isDefaultPool())
return 1;
else if (p2.isDefaultPool())
return -1;
else return p1.getName().compareTo(p2.getName());
}});
int numActivePools = 0;
int totalRunningMaps = 0;
int totalWaitingMaps = 0;
int totalRunningReduces = 0;
int totalWaitingReduces = 0;
double totalWaitTime = 0;
int totalNumTasks = 0;
int totalMinReduces = 0;
int totalMaxReduces = 0;
int totalMinMaps = 0;
int totalMaxMaps = 0;
int totalRunningJobs = 0;
double totalCpu = 0;
double totalMemory = 0;
for (Pool pool: pools) {
int runningMaps = 0;
int waitingMaps = 0;
int runningReduces = 0;
int waitingReduces = 0;
long[] totalWaitTimeOfTasks = new long[1];
long[] numTasks = new long[1];
totalWaitTimeOfTasks[0] = 0;
numTasks[0] = 0;
long avgWaitTime = 0;
long now = System.currentTimeMillis();
for (JobInProgress job: pool.getJobs()) {
JobInfo info = scheduler.infos.get(job);
if (info != null) {
runningMaps += info.runningMaps;
runningReduces += info.runningReduces;
waitingMaps += info.neededMaps;
waitingReduces += info.neededReduces;
// calculate the wait time of all tasks. Do not use killed tasks.
// The wait time of reducers is not a precise reflection of the slowness of the
// cluster because we start scheduling reducers only when a certain percentage
// of maps are completed.
calculateWaitTime(job, jobTracker.getMapTaskReports(job.getJobID()),
totalWaitTimeOfTasks, numTasks, now);
calculateWaitTime(job, jobTracker.getReduceTaskReports(job.getJobID()),
totalWaitTimeOfTasks, numTasks, now);
calculateWaitTime(job, jobTracker.getSetupTaskReports(job.getJobID()),
totalWaitTimeOfTasks, numTasks, now);
}
}
if (numTasks[0] != 0) {
avgWaitTime = totalWaitTimeOfTasks[0]/numTasks[0];
totalWaitTime += totalWaitTimeOfTasks[0];
totalNumTasks += numTasks[0];
}
String poolName = pool.getName();
int runningJobs = pool.getJobs().size();
int minMaps = poolManager.getAllocation(poolName, TaskType.MAP);
int minReduces = poolManager.getAllocation(poolName, TaskType.REDUCE);
int maxMaps = poolManager.getMaxSlots(poolName, TaskType.MAP);
int maxReduces = poolManager.getMaxSlots(poolName, TaskType.REDUCE);
totalRunningJobs += runningJobs;
totalRunningMaps += runningMaps;
totalWaitingMaps += waitingMaps;
totalRunningReduces += runningReduces;
totalWaitingReduces += waitingReduces;
totalMinMaps += minMaps;
totalMinReduces += minReduces;
if (runningJobs == 0 && minMaps == 0 && minReduces == 0 &&
maxMaps == Integer.MAX_VALUE && maxReduces == Integer.MAX_VALUE &&
runningMaps == 0 && runningReduces == 0) {
continue;
}
numActivePools++;
out.print("<tr>\n");
out.printf("<td>%s</td>\n", poolName);
out.printf("<td>%s</td>\n", runningJobs);
out.printf("<td>%s</td>\n", minMaps);
out.printf("<td>%s</td>\n", minReduces);
if (maxMaps == Integer.MAX_VALUE) {
out.printf("<td>-</td>\n");
} else {
out.printf("<td>%s</td>\n", maxMaps);
totalMaxMaps += maxMaps;
}
if (maxReduces == Integer.MAX_VALUE) {
out.printf("<td>-</td>\n");
} else {
out.printf("<td>%s</td>\n", maxReduces);
totalMaxReduces += maxReduces;
}
out.printf("<td>%s/%s</td>\n", runningMaps, waitingMaps);
out.printf("<td>%s/%s</td>\n", runningReduces, waitingReduces);
// Compute the CPU and memory usage
double cpuUsage = 0; // in percentage
double memoryUsage = 0; // in percentage
if (reporter != null) {
for (JobInProgress job : pool.getJobs()) {
double cpu =
reporter.getJobCpuPercentageOnCluster(job.getJobID());
double memory =
reporter.getJobMemPercentageOnCluster(job.getJobID());
cpuUsage += cpu != ResourceReporter.UNAVAILABLE ? cpu : 0;
memoryUsage += memory != ResourceReporter.UNAVAILABLE ?
memory : 0;
}
out.printf("<td>%.1f%%</td>\n", cpuUsage);
out.printf("<td>%.1f%%</td>\n", memoryUsage);
}
totalCpu += cpuUsage;
totalMemory += memoryUsage;
out.printf("<td>%s</td>\n", avgWaitTime/1000D);
out.print("</tr>\n");
}
out.print("<tr>\n");
out.printf("<td>Total</td>\n");
out.printf("<td>%s</td>\n", totalRunningJobs);
out.printf("<td>%s</td>\n", totalMinMaps);
out.printf("<td>%s</td>\n", totalMinReduces);
if (totalMaxMaps == 0) {
out.printf("<td>-</td>\n");
} else {
out.printf("<td>%s</td>\n", totalMaxMaps);
}
if (totalMaxReduces == 0) {
out.printf("<td>-</td>\n");
} else {
out.printf("<td>%s</td>\n", totalMaxReduces);
}
out.printf("<td>%s/%s</td>\n", totalRunningMaps, totalWaitingMaps);
out.printf("<td>%s/%s</td>\n",
totalRunningReduces, totalWaitingReduces);
if (reporter != null) {
out.printf("<td>%.1f%%</td>\n", totalCpu);
out.printf("<td>%.1f%%</td>\n", totalMemory);
}
out.printf("<td>%.1f</td>\n", (totalWaitTime /
Math.max(1.0, (double)totalNumTasks)) / 1000D);
out.print("</tr>\n");
out.print("</table>\n");
out.printf("<p>Number of active/total pools : %d/%d</p>",
numActivePools, pools.size());
}
}
}
/**
* Calculate the total wait time of all tasks
*/
private void calculateWaitTime(JobInProgress job, TaskReport[] reports,
long[] totalWaitTimeOfTasks, long numTasks[], long now) {
long aggr = 0;
long count = 0;
for (int i = 0; i < reports.length; i++) {
TaskReport report = reports[i];
if (reports[i].getCurrentStatus() == TIPStatus.PENDING) {
aggr += (now - job.getStartTime());
count++;
} else if (reports[i].getCurrentStatus() == TIPStatus.COMPLETE ||
reports[i].getCurrentStatus() == TIPStatus.RUNNING) {
aggr += (report.getStartTime() - job.getStartTime());
count++;
}
}
totalWaitTimeOfTasks[0] += aggr;
numTasks[0] += count;
}
/**
* Print a view of running jobs to the given output writer.
*/
private void showJobs(PrintWriter out, boolean advancedView) {
ResourceReporter reporter = jobTracker.getResourceReporter();
out.print("<h2>Running Jobs</h2>\n");
out.print("<table border=\"2\" cellpadding=\"5\" cellspacing=\"2\">\n");
int colsPerTaskType = advancedView ? 6 : 3;
out.printf("<tr><th rowspan=2>Submitted</th>" +
"<th rowspan=2>JobID</th>" +
"<th rowspan=2>User</th>" +
"<th rowspan=2>Name</th>" +
"<th rowspan=2>Pool</th>" +
"<th rowspan=2>Priority</th>" +
"<th colspan=%d>Maps</th>" +
"<th colspan=%d>Reduces</th>" +
( reporter != null ?
"<th colspan=2>CPU</th>" +
"<th colspan=3>MEM</th>" : ""),
colsPerTaskType, colsPerTaskType);
out.print("</tr><tr>\n");
out.print("<th>Finished</th><th>Running</th><th>Fair Share</th>" +
(advancedView ? "<th>Weight</th><th>Deficit</th><th>minMaps</th>" : ""));
out.print("<th>Finished</th><th>Running</th><th>Fair Share</th>" +
(advancedView ? "<th>Weight</th><th>Deficit</th><th>minReduces</th>" : ""));
if (reporter != null) {
out.print("<th>Now</th><th>Cumulated</th>" +
"<th>Now</th><th>Cumulated</th><th>Max/Node</th>");
}
out.print("</tr>\n");
synchronized (jobTracker) {
Collection<JobInProgress> runningJobs = getInitedJobs();
synchronized (scheduler) {
for (JobInProgress job: runningJobs) {
JobProfile profile = job.getProfile();
JobInfo info = scheduler.infos.get(job);
if (info == null) { // Job finished, but let's show 0's for info
info = new JobInfo(0);
}
out.print("<tr>\n");
out.printf("<td>%s</td>\n", DATE_FORMAT.format(
new Date(job.getStartTime())));
out.printf("<td><a href=\"jobdetails.jsp?jobid=%s\">%s</a></td>",
profile.getJobID(), profile.getJobID());
out.printf("<td>%s</td>\n", profile.getUser());
out.printf("<td>%s</td>\n", profile.getJobName());
out.printf("<td>%s</td>\n", generateSelect(
scheduler.getPoolManager().getPoolNames(),
scheduler.getPoolManager().getPoolName(job),
"/scheduler?setPool=<CHOICE>&jobid=" + profile.getJobID() +
(advancedView ? "&advanced" : "")));
out.printf("<td>%s</td>\n", generateSelect(
Arrays.asList(new String[]
{"VERY_LOW", "LOW", "NORMAL", "HIGH", "VERY_HIGH"}),
job.getPriority().toString(),
"/scheduler?setPriority=<CHOICE>&jobid=" + profile.getJobID() +
(advancedView ? "&advanced" : "")));
out.printf("<td>%d / %d</td><td>%d</td><td>%8.1f</td>\n",
job.finishedMaps(), job.desiredMaps(), info.runningMaps,
info.mapFairShare);
if (advancedView) {
out.printf("<td>%8.1f</td>\n", info.mapWeight);
out.printf("<td>%s</td>\n", info.neededMaps > 0 ?
(info.mapDeficit / 1000) + "s" : "--");
out.printf("<td>%d</td>\n", info.minMaps);
}
out.printf("<td>%d / %d</td><td>%d</td><td>%8.1f</td>\n",
job.finishedReduces(), job.desiredReduces(), info.runningReduces,
info.reduceFairShare);
if (advancedView) {
out.printf("<td>%8.1f</td>\n", info.reduceWeight);
out.printf("<td>%s</td>\n", info.neededReduces > 0 ?
(info.reduceDeficit / 1000) + "s" : "--");
out.printf("<td>%d</td>\n", info.minReduces);
}
if (reporter != null) {
JobID jobId = profile.getJobID();
double cpu = reporter.getJobCpuPercentageOnCluster(jobId);
double mem = reporter.getJobMemPercentageOnCluster(jobId);
double cpuTime = reporter.getJobCpuCumulatedUsageTime(jobId);
double memTime = reporter.getJobMemCumulatedUsageTime(jobId);
double memMax = reporter.getJobMemMaxPercentageOnBox(jobId);
if (cpu == ResourceReporter.UNAVAILABLE ||
mem == ResourceReporter.UNAVAILABLE ||
cpuTime == ResourceReporter.UNAVAILABLE ||
memTime == ResourceReporter.UNAVAILABLE ||
memMax == ResourceReporter.UNAVAILABLE) {
out.printf("<td>-</td><td>-</td><td>-</td><td>-</td><td>-</td>");
continue;
}
out.printf("<td>%.1f%%</td>\n", cpu);
out.printf("<td>%.1f sec</td>\n", cpuTime / 1000D);
out.printf("<td>%.1f%%</td>\n", mem);
out.printf("<td>%.1f sec</td>\n", memTime / 1000D);
if (memMax > 50) {
out.printf("<td><font color=\"red\">%.1f%%</font></td>\n",
memMax);
} else {
out.printf("<td>%.1f%%</td>\n", memMax);
}
}
out.print("</tr>\n");
}
}
}
out.print("</table>\n");
}
/**
* Generate a HTML select control with a given list of choices and a given
* option selected. When the selection is changed, take the user to the
* <code>submitUrl</code>. The <code>submitUrl</code> can be made to include
* the option selected -- the first occurrence of the substring
* <code><CHOICE></code> will be replaced by the option chosen.
*/
private String generateSelect(Iterable<String> choices,
String selectedChoice, String submitUrl) {
StringBuilder html = new StringBuilder();
String id = "select" + lastId++;
html.append("<select id=\"" + id + "\" name=\"" + id + "\" " +
"onchange=\"window.location = '" + submitUrl +
"'.replace('<CHOICE>', document.getElementById('" + id +
"').value);\">\n");
for (String choice: choices) {
html.append(String.format("<option value=\"%s\"%s>%s</option>\n",
choice, (choice.equals(selectedChoice) ? " selected" : ""), choice));
}
html.append("</select>\n");
return html.toString();
}
/**
* Print the administration form at the bottom of the page, which currently
* only includes the button for switching between FIFO and Fair Scheduling.
*/
private void showAdminFormJobComparator(PrintWriter out, boolean advancedView) {
out.print("<h2>Scheduling Mode</h2>\n");
String curMode = scheduler.getJobComparator().toString();
String advParam = advancedView ? "&advanced" : "";
out.printf("<p>The scheduler is currently using <b>%s mode</b>.",
generateSelect((Collection<String>)
Arrays.asList("FAIR,DEFICIT,FIFO".split(",")),
curMode, "/scheduler?setJobComparator=<CHOICE>" + advParam));
}
/**
* Print the administration form at the bottom of the page, which currently
* only includes the button for switching between FIFO and Fair Scheduling.
*/
private void showAdminFormLocalityDelay(PrintWriter out, boolean advancedView) {
out.print("<h2>Locality Delay</h2>\n");
String advParam = advancedView ? "&advanced" : "";
long localityDelayRackLocal = scheduler.getLocalityDelayRackLocal();
long localityDelayNodeLocal = scheduler.getLocalityDelayNodeLocal();
Collection<String> possibleDelay = Arrays.asList(
("0,1000,2000,3000,4000,5000,10000,15000,20000,25000,30000").split(","));
out.printf("<p>Mapper NODE locality delay = <b>%s milliseconds</b>.",
generateSelect(possibleDelay, "" + localityDelayNodeLocal,
"/scheduler?setLocalityDelayNodeLocal=<CHOICE>" + advParam));
out.printf("<p>Mapper RACK locality delay = <b>%s milliseconds</b>.",
generateSelect(possibleDelay, "" + localityDelayRackLocal,
"/scheduler?setLocalityDelayRackLocal=<CHOICE>" + advParam));
}
/**
* Print the administration form for preemption
*/
private void showAdminFormPreemption(PrintWriter out, boolean advancedView) {
out.print("<h2>Task Preemption</h2>\n");
String advParam = advancedView ? "&advanced" : "";
out.print(generateSelect(Arrays.asList("On,Off".split(",")),
scheduler.isPreemptionEnabled() ? "On" : "Off",
"/scheduler?setPreemptionEnabled=<CHOICE>" + advParam));
}
/**
* Print the administration form for the MemBasedLoadManager
*/
private void showAdminFormMemBasedLoadMgr(PrintWriter out,
boolean advancedView) {
if (!(loadMgr instanceof MemBasedLoadManager)) {
return;
}
out.print("<h2>Memory Based Scheduling</h2>\n");
MemBasedLoadManager memLoadMgr = (MemBasedLoadManager)loadMgr;
Collection<String> possibleThresholds =
Arrays.asList(("0,1,2,3,4,5,6,7,8,9,10,1000").split(","));
long reservedMemGB =
(long)(memLoadMgr.getReservedPhysicalMemoryOnTT() / 1024D + 0.5);
out.printf("<p>Reserve %s GB memory on one node.",
generateSelect(possibleThresholds, "" + reservedMemGB,
"/scheduler?setTtThreshold=<CHOICE>" +
(advancedView ? "&advanced" : "")));
}
/**
* Print the cluster resource utilization
*/
private void showCluster(
PrintWriter out, boolean advancedView) {
String cluster = "";
try {
cluster = JSPUtil.generateClusterResTable(jobTracker);
if (cluster.equals("")) {
return;
}
} catch (IOException e) {
return;
}
out.print("<h2>Cluster Resource</h2>\n");
out.print(cluster);
}
/**
* Print the UI that allows us to change the number of tasks assigned per
* heartbeat.
*/
private void showNumTaskPerHeartBeatOption(
PrintWriter out, boolean advancedView) {
out.print("<h2>Number of Assigned Tasks Per HeartBeat</h2>\n");
out.printf("<p>Number of map tasks assigned per heartbeat:%s",
generateSelect(Arrays.asList("1,2,3,4,5,6,7,8,9,10".split(",")),
scheduler.getMapPerHeartBeat() + "",
"/scheduler?setMapPerHeartBeat=<CHOICE>" +
(advancedView ? "&advanced" : "")));
out.printf("<p>Number of reduce tasks assigned per heartbeat:%s",
generateSelect(Arrays.asList("1,2,3,4,5,6,7,8,9,10".split(",")),
scheduler.getReducePerHeartBeat() + "",
"/scheduler?setReducePerHeartBeat=<CHOICE>" +
(advancedView ? "&advanced" : "")));
}
/**
* Obtained all initialized jobs
*/
private Collection<JobInProgress> getInitedJobs() {
Collection<JobInProgress> runningJobs = jobTracker.getRunningJobs();
for (Iterator<JobInProgress> it = runningJobs.iterator(); it.hasNext();) {
JobInProgress job = it.next();
if (!job.inited()) {
it.remove();
}
}
return runningJobs;
}
}