hadoop SLSWebApp 源码
haddop SLSWebApp 代码
文件路径：/hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/web/SLSWebApp.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.sls.web;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.nio.charset.StandardCharsets;
import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.IOUtils;
import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.SchedulerEventType;
import org.apache.hadoop.yarn.sls.SLSRunner;
import org.apache.hadoop.yarn.sls.scheduler.FairSchedulerMetrics;
import org.apache.hadoop.yarn.sls.scheduler.SchedulerMetrics;
import org.apache.hadoop.yarn.sls.scheduler.SchedulerWrapper;
import org.apache.hadoop.yarn.sls.utils.NodeUsageRanges;
import org.eclipse.jetty.http.MimeTypes;
import org.eclipse.jetty.server.Handler;
import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.AbstractHandler;
import org.eclipse.jetty.server.handler.ResourceHandler;
import com.codahale.metrics.Counter;
import com.codahale.metrics.Gauge;
import com.codahale.metrics.Histogram;
import com.codahale.metrics.MetricRegistry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@Private
@Unstable
public class SLSWebApp extends HttpServlet {
private static final Logger LOG = LoggerFactory.getLogger(SLSWebApp.class);
private static final long serialVersionUID = 1905162041950251407L;
private transient Server server;
private transient SchedulerWrapper wrapper;
private transient MetricRegistry metrics;
private transient SchedulerMetrics schedulerMetrics;
// metrics objects
private transient Gauge jvmFreeMemoryGauge;
private transient Gauge jvmMaxMemoryGauge;
private transient Gauge jvmTotalMemoryGauge;
private transient Gauge numRunningAppsGauge;
private transient Gauge numRunningContainersGauge;
private transient Gauge allocatedMemoryGauge;
private transient Gauge allocatedVCoresGauge;
private transient Gauge availableMemoryGauge;
private transient Gauge availableVCoresGauge;
private transient Map<String, Gauge> perNodeUsageGaugeMap;
private transient Histogram allocateTimecostHistogram;
private transient Histogram commitSuccessTimecostHistogram;
private transient Histogram commitFailureTimecostHistogram;
private transient Histogram handleTimecostHistogram;
private transient Map<SchedulerEventType, Histogram>
handleOperTimecostHistogramMap;
private transient Map<String, Counter> queueAllocatedMemoryCounterMap;
private transient Map<String, Counter> queueAllocatedVCoresCounterMap;
private int port;
private int ajaxUpdateTimeMS = 1000;
// html page templates
private String simulateInfoTemplate;
private String simulateTemplate;
private String trackTemplate;
private transient Counter schedulerCommitSuccessCounter;
private transient Counter schedulerCommitFailureCounter;
private Long lastTrackingTime;
private Long lastSchedulerCommitSuccessCount;
private Long lastSchedulerCommitFailureCount;
{
// load templates
ClassLoader cl = Thread.currentThread().getContextClassLoader();
try {
simulateInfoTemplate = IOUtils.toString(
cl.getResourceAsStream("html/simulate.info.html.template"), StandardCharsets.UTF_8);
simulateTemplate = IOUtils.toString(
cl.getResourceAsStream("html/simulate.html.template"), StandardCharsets.UTF_8);
trackTemplate = IOUtils.toString(
cl.getResourceAsStream("html/track.html.template"), StandardCharsets.UTF_8);
} catch (IOException e) {
LOG.error("Caught exception while initializing templates", e);
}
}
private void readObject(ObjectInputStream in) throws IOException,
ClassNotFoundException {
in.defaultReadObject();
handleOperTimecostHistogramMap = new HashMap<>();
queueAllocatedMemoryCounterMap = new HashMap<>();
queueAllocatedVCoresCounterMap = new HashMap<>();
}
public SLSWebApp(SchedulerWrapper wrapper, int metricsAddressPort) {
this.wrapper = wrapper;
handleOperTimecostHistogramMap = new HashMap<>();
queueAllocatedMemoryCounterMap = new HashMap<>();
queueAllocatedVCoresCounterMap = new HashMap<>();
perNodeUsageGaugeMap = new HashMap<>();
schedulerMetrics = wrapper.getSchedulerMetrics();
metrics = schedulerMetrics.getMetrics();
port = metricsAddressPort;
}
public void start() throws Exception {
final ResourceHandler staticHandler = new ResourceHandler();
staticHandler.setMimeTypes(new MimeTypes());
String webRootDir = getClass().getClassLoader().getResource("html").
toExternalForm();
staticHandler.setResourceBase(webRootDir);
Handler handler = new AbstractHandler() {
@Override
public void handle(String target, Request baseRequest,
HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException {
try{
// timeunit
int timeunit = 1000; // second, divide millionsecond / 1000
String timeunitLabel = "second";
if (request.getParameter("u")!= null &&
request.getParameter("u").equalsIgnoreCase("m")) {
timeunit = 1000 * 60;
timeunitLabel = "minute";
}
// http request
if (target.equals("/")) {
printPageIndex(request, response);
} else if (target.equals("/simulate")) {
printPageSimulate(request, response, timeunit, timeunitLabel);
} else if (target.equals("/track")) {
printPageTrack(request, response, timeunit, timeunitLabel);
} else
// js/css request
if (target.startsWith("/js") || target.startsWith("/css")) {
response.setCharacterEncoding("utf-8");
staticHandler.handle(target, baseRequest, request, response);
} else
// json request
if (target.equals("/simulateMetrics")) {
printJsonMetrics(request, response);
} else if (target.equals("/trackMetrics")) {
printJsonTrack(request, response);
}
} catch (Exception e) {
LOG.error("Caught exception while starting SLSWebApp", e);
}
}
};
server = new Server(port);
server.setHandler(handler);
server.start();
}
public void stop() throws Exception {
if (server != null) {
server.stop();
}
}
/**
* index html page, show simulation info
* path ""
* @param request http request
* @param response http response
* @throws java.io.IOException
*/
private void printPageIndex(HttpServletRequest request,
HttpServletResponse response) throws IOException {
response.setContentType("text/html");
response.setStatus(HttpServletResponse.SC_OK);
String simulateInfo;
if (SLSRunner.getSimulateInfoMap().isEmpty()) {
String empty = "<tr><td colspan='2' align='center'>" +
"No information available</td></tr>";
simulateInfo = MessageFormat.format(simulateInfoTemplate, empty);
} else {
StringBuilder info = new StringBuilder();
for (Map.Entry<String, Object> entry :
SLSRunner.getSimulateInfoMap().entrySet()) {
info.append("<tr>");
info.append("<td class='td1'>").append(entry.getKey()).append("</td>");
info.append("<td class='td2'>").append(entry.getValue())
.append("</td>");
info.append("</tr>");
}
simulateInfo =
MessageFormat.format(simulateInfoTemplate, info.toString());
}
response.getWriter().println(simulateInfo);
((Request) request).setHandled(true);
}
/**
* simulate html page, show several real-runtime chart
* path "/simulate"
* use d3.js
* @param request http request
* @param response http response
* @throws java.io.IOException
*/
private void printPageSimulate(HttpServletRequest request,
HttpServletResponse response, int timeunit,
String timeunitLabel)
throws IOException {
response.setContentType("text/html");
response.setStatus(HttpServletResponse.SC_OK);
// queues {0}
Set<String> queues = wrapper.getTracker().getQueueSet();
StringBuilder queueInfo = new StringBuilder();
int i = 0;
for (String queue : queues) {
queueInfo.append("legends[4][").append(i).append("] = 'queue.")
.append(queue).append(".allocated.memory';");
queueInfo.append("legends[5][").append(i).append("] = 'queue.")
.append(queue).append(".allocated.vcores';");
i ++;
}
// time unit label {1}
// time unit {2}
// ajax update time interval {3}
String simulateInfo = MessageFormat.format(simulateTemplate,
queueInfo.toString(), timeunitLabel, "" + timeunit,
"" + ajaxUpdateTimeMS);
response.getWriter().println(simulateInfo);
((Request) request).setHandled(true);
}
/**
* html page for tracking one queue or job
* use d3.js
* @param request http request
* @param response http response
* @throws java.io.IOException
*/
private void printPageTrack(HttpServletRequest request,
HttpServletResponse response, int timeunit,
String timeunitLabel)
throws IOException {
response.setContentType("text/html");
response.setStatus(HttpServletResponse.SC_OK);
// tracked queues {0}
StringBuilder trackedQueueInfo = new StringBuilder();
Set<String> trackedQueues = wrapper.getTracker().getQueueSet();
for(String queue : trackedQueues) {
trackedQueueInfo.append("<option value='Queue ").append(queue)
.append("'>").append(queue).append("</option>");
}
// tracked apps {1}
StringBuilder trackedAppInfo = new StringBuilder();
Set<String> trackedApps = wrapper.getTracker().getTrackedAppSet();
for(String job : trackedApps) {
trackedAppInfo.append("<option value='Job ").append(job)
.append("'>").append(job).append("</option>");
}
// timeunit label {2}
// time unit {3}
// ajax update time {4}
// final html
String trackInfo = MessageFormat.format(trackTemplate,
trackedQueueInfo.toString(), trackedAppInfo.toString(),
timeunitLabel, "" + timeunit, "" + ajaxUpdateTimeMS);
response.getWriter().println(trackInfo);
((Request) request).setHandled(true);
}
/**
* package metrics information in a json and return
* @param request http request
* @param response http response
* @throws java.io.IOException
*/
private void printJsonMetrics(HttpServletRequest request,
HttpServletResponse response)
throws IOException {
response.setContentType("text/json");
response.setStatus(HttpServletResponse.SC_OK);
response.getWriter().println(generateRealTimeTrackingMetrics());
((Request) request).setHandled(true);
}
public String generateRealTimeTrackingMetrics() {
// JVM
double jvmFreeMemoryGB, jvmMaxMemoryGB, jvmTotalMemoryGB;
if (jvmFreeMemoryGauge == null &&
metrics.getGauges().containsKey("variable.jvm.free.memory")) {
jvmFreeMemoryGauge = metrics.getGauges().get("variable.jvm.free.memory");
}
if (jvmMaxMemoryGauge == null &&
metrics.getGauges().containsKey("variable.jvm.max.memory")) {
jvmMaxMemoryGauge = metrics.getGauges().get("variable.jvm.max.memory");
}
if (jvmTotalMemoryGauge == null &&
metrics.getGauges().containsKey("variable.jvm.total.memory")) {
jvmTotalMemoryGauge = metrics.getGauges()
.get("variable.jvm.total.memory");
}
jvmFreeMemoryGB = jvmFreeMemoryGauge == null ? 0 :
Double.parseDouble(jvmFreeMemoryGauge.getValue().toString())
/1024/1024/1024;
jvmMaxMemoryGB = jvmMaxMemoryGauge == null ? 0 :
Double.parseDouble(jvmMaxMemoryGauge.getValue().toString())
/1024/1024/1024;
jvmTotalMemoryGB = jvmTotalMemoryGauge == null ? 0 :
Double.parseDouble(jvmTotalMemoryGauge.getValue().toString())
/1024/1024/1024;
// number of running applications/containers
String numRunningApps, numRunningContainers;
if (numRunningAppsGauge == null &&
metrics.getGauges().containsKey("variable.running.application")) {
numRunningAppsGauge =
metrics.getGauges().get("variable.running.application");
}
if (numRunningContainersGauge == null &&
metrics.getGauges().containsKey("variable.running.container")) {
numRunningContainersGauge =
metrics.getGauges().get("variable.running.container");
}
numRunningApps = numRunningAppsGauge == null ? "0" :
numRunningAppsGauge.getValue().toString();
numRunningContainers = numRunningContainersGauge == null ? "0" :
numRunningContainersGauge.getValue().toString();
// cluster available/allocate resource
double allocatedMemoryGB, allocatedVCoresGB,
availableMemoryGB, availableVCoresGB;
if (allocatedMemoryGauge == null &&
metrics.getGauges()
.containsKey("variable.cluster.allocated.memory")) {
allocatedMemoryGauge = metrics.getGauges()
.get("variable.cluster.allocated.memory");
}
if (allocatedVCoresGauge == null &&
metrics.getGauges()
.containsKey("variable.cluster.allocated.vcores")) {
allocatedVCoresGauge = metrics.getGauges()
.get("variable.cluster.allocated.vcores");
}
if (availableMemoryGauge == null &&
metrics.getGauges()
.containsKey("variable.cluster.available.memory")) {
availableMemoryGauge = metrics.getGauges()
.get("variable.cluster.available.memory");
}
if (availableVCoresGauge == null &&
metrics.getGauges()
.containsKey("variable.cluster.available.vcores")) {
availableVCoresGauge = metrics.getGauges()
.get("variable.cluster.available.vcores");
}
allocatedMemoryGB = allocatedMemoryGauge == null ? 0 :
Double.parseDouble(allocatedMemoryGauge.getValue().toString())/1024;
allocatedVCoresGB = allocatedVCoresGauge == null ? 0 :
Double.parseDouble(allocatedVCoresGauge.getValue().toString());
availableMemoryGB = availableMemoryGauge == null ? 0 :
Double.parseDouble(availableMemoryGauge.getValue().toString())/1024;
availableVCoresGB = availableVCoresGauge == null ? 0 :
Double.parseDouble(availableVCoresGauge.getValue().toString());
// scheduler operation
double allocateTimecost, commitSuccessTimecost, commitFailureTimecost,
handleTimecost;
if (allocateTimecostHistogram == null &&
metrics.getHistograms().containsKey(
"sampler.scheduler.operation.allocate.timecost")) {
allocateTimecostHistogram = metrics.getHistograms()
.get("sampler.scheduler.operation.allocate.timecost");
}
if (commitSuccessTimecostHistogram == null &&
metrics.getHistograms().containsKey(
"sampler.scheduler.operation.commit.success.timecost")) {
commitSuccessTimecostHistogram = metrics.getHistograms()
.get("sampler.scheduler.operation.commit.success.timecost");
}
if (commitFailureTimecostHistogram == null &&
metrics.getHistograms().containsKey(
"sampler.scheduler.operation.commit.failure.timecost")) {
commitFailureTimecostHistogram = metrics.getHistograms()
.get("sampler.scheduler.operation.commit.failure.timecost");
}
if (handleTimecostHistogram == null &&
metrics.getHistograms().containsKey(
"sampler.scheduler.operation.handle.timecost")) {
handleTimecostHistogram = metrics.getHistograms()
.get("sampler.scheduler.operation.handle.timecost");
}
allocateTimecost = allocateTimecostHistogram == null ? 0.0 :
allocateTimecostHistogram.getSnapshot().getMean()/1000000;
commitSuccessTimecost = commitSuccessTimecostHistogram == null ? 0.0 :
commitSuccessTimecostHistogram.getSnapshot().getMean()/1000000;
commitFailureTimecost = commitFailureTimecostHistogram == null ? 0.0 :
commitFailureTimecostHistogram.getSnapshot().getMean()/1000000;
handleTimecost = handleTimecostHistogram == null ? 0.0 :
handleTimecostHistogram.getSnapshot().getMean()/1000000;
// various handle operation
Map<SchedulerEventType, Double> handleOperTimecostMap =
new HashMap<SchedulerEventType, Double>();
for (SchedulerEventType e : SchedulerEventType.values()) {
String key = "sampler.scheduler.operation.handle." + e + ".timecost";
if (! handleOperTimecostHistogramMap.containsKey(e) &&
metrics.getHistograms().containsKey(key)) {
handleOperTimecostHistogramMap.put(e, metrics.getHistograms().get(key));
}
double timecost = handleOperTimecostHistogramMap.containsKey(e) ?
handleOperTimecostHistogramMap.get(e).getSnapshot().getMean()/1000000
: 0;
handleOperTimecostMap.put(e, timecost);
}
// allocated resource for each queue
Map<String, Double> queueAllocatedMemoryMap = new HashMap<String, Double>();
Map<String, Long> queueAllocatedVCoresMap = new HashMap<String, Long>();
for (String queue : wrapper.getTracker().getQueueSet()) {
// memory
String key = "counter.queue." + queue + ".allocated.memory";
if (! queueAllocatedMemoryCounterMap.containsKey(queue) &&
metrics.getCounters().containsKey(key)) {
queueAllocatedMemoryCounterMap.put(queue,
metrics.getCounters().get(key));
}
double queueAllocatedMemoryGB =
queueAllocatedMemoryCounterMap.containsKey(queue) ?
queueAllocatedMemoryCounterMap.get(queue).getCount()/1024.0
: 0;
queueAllocatedMemoryMap.put(queue, queueAllocatedMemoryGB);
// vCores
key = "counter.queue." + queue + ".allocated.cores";
if (! queueAllocatedVCoresCounterMap.containsKey(queue) &&
metrics.getCounters().containsKey(key)) {
queueAllocatedVCoresCounterMap.put(
queue, metrics.getCounters().get(key));
}
long queueAllocatedVCores =
queueAllocatedVCoresCounterMap.containsKey(queue) ?
queueAllocatedVCoresCounterMap.get(queue).getCount(): 0;
queueAllocatedVCoresMap.put(queue, queueAllocatedVCores);
}
// calculate commit throughput, unit is number/second
if (schedulerCommitSuccessCounter == null && metrics.getCounters()
.containsKey("counter.scheduler.operation.commit.success")) {
schedulerCommitSuccessCounter = metrics.getCounters()
.get("counter.scheduler.operation.commit.success");
}
if (schedulerCommitFailureCounter == null && metrics.getCounters()
.containsKey("counter.scheduler.operation.commit.failure")) {
schedulerCommitFailureCounter = metrics.getCounters()
.get("counter.scheduler.operation.commit.failure");
}
long schedulerCommitSuccessThroughput = 0;
long schedulerCommitFailureThroughput = 0;
if (schedulerCommitSuccessCounter != null
&& schedulerCommitFailureCounter != null) {
long currentTrackingTime = System.currentTimeMillis();
long currentSchedulerCommitSucessCount =
schedulerCommitSuccessCounter.getCount();
long currentSchedulerCommitFailureCount =
schedulerCommitFailureCounter.getCount();
if (lastTrackingTime != null) {
double intervalSeconds =
(double) (currentTrackingTime - lastTrackingTime) / 1000;
schedulerCommitSuccessThroughput = Math.round(
(currentSchedulerCommitSucessCount
- lastSchedulerCommitSuccessCount) / intervalSeconds);
schedulerCommitFailureThroughput = Math.round(
(currentSchedulerCommitFailureCount
- lastSchedulerCommitFailureCount) / intervalSeconds);
}
lastTrackingTime = currentTrackingTime;
lastSchedulerCommitSuccessCount = currentSchedulerCommitSucessCount;
lastSchedulerCommitFailureCount = currentSchedulerCommitFailureCount;
}
// package results
StringBuilder sb = new StringBuilder();
sb.append("{");
sb.append("\"time\":" ).append(System.currentTimeMillis())
.append(",\"jvm.free.memory\":").append(jvmFreeMemoryGB)
.append(",\"jvm.max.memory\":").append(jvmMaxMemoryGB)
.append(",\"jvm.total.memory\":").append(jvmTotalMemoryGB)
.append(",\"running.applications\":").append(numRunningApps)
.append(",\"running.containers\":").append(numRunningContainers)
.append(",\"cluster.allocated.memory\":").append(allocatedMemoryGB)
.append(",\"cluster.allocated.vcores\":").append(allocatedVCoresGB)
.append(",\"cluster.available.memory\":").append(availableMemoryGB)
.append(",\"cluster.available.vcores\":").append(availableVCoresGB);
for (String queue : wrapper.getTracker().getQueueSet()) {
sb.append(",\"queue.").append(queue).append(".allocated.memory\":")
.append(queueAllocatedMemoryMap.get(queue));
sb.append(",\"queue.").append(queue).append(".allocated.vcores\":")
.append(queueAllocatedVCoresMap.get(queue));
}
// scheduler allocate & handle
sb.append(",\"scheduler.allocate.timecost\":").append(allocateTimecost);
sb.append(",\"scheduler.commit.success.timecost\":")
.append(commitSuccessTimecost);
sb.append(",\"scheduler.commit.failure.timecost\":")
.append(commitFailureTimecost);
sb.append(",\"scheduler.commit.success.throughput\":")
.append(schedulerCommitSuccessThroughput);
sb.append(",\"scheduler.commit.failure.throughput\":")
.append(schedulerCommitFailureThroughput);
sb.append(",\"scheduler.handle.timecost\":").append(handleTimecost);
for (SchedulerEventType e : SchedulerEventType.values()) {
sb.append(",\"scheduler.handle-").append(e).append(".timecost\":")
.append(handleOperTimecostMap.get(e));
}
sb.append(generateNodeUsageMetrics("memory"));
sb.append(generateNodeUsageMetrics("vcores"));
sb.append("}");
return sb.toString();
}
private String generateNodeUsageMetrics(String resourceType) {
StringBuilder sb = new StringBuilder();
Map<String, Integer> perNodeUsageMap = new HashMap<>();
for (NodeUsageRanges.Range range : NodeUsageRanges.getRanges()) {
String metricName = "nodes." + resourceType + "." + range.getKeyword();
if (!perNodeUsageGaugeMap.containsKey(metricName) &&
metrics.getGauges().containsKey(metricName)) {
perNodeUsageGaugeMap.put(metricName,
metrics.getGauges().get(metricName));
}
int perNodeUsageCount =
perNodeUsageGaugeMap.containsKey(metricName) ?
Integer.parseInt(
perNodeUsageGaugeMap.get(metricName).getValue().toString()) : 0;
perNodeUsageMap.put(metricName, perNodeUsageCount);
}
// per node memory and vcores used
for (NodeUsageRanges.Range range : NodeUsageRanges.getRanges()) {
String metricName = "nodes." + resourceType + "." + range.getKeyword();
sb.append(",\"").append(metricName).append("\":")
.append(perNodeUsageMap.get(metricName));
}
return sb.toString();
}
/**
* package metrics information for one tracked queue/app
* only support FairScheduler currently
* @throws java.io.IOException
*/
private void printJsonTrack(HttpServletRequest request,
HttpServletResponse response) throws IOException {
response.setContentType("text/json");
response.setStatus(HttpServletResponse.SC_OK);
StringBuilder sb = new StringBuilder();
if(schedulerMetrics instanceof FairSchedulerMetrics) {
String para = request.getParameter("t");
if (para.startsWith("Job ")) {
String appId = para.substring("Job ".length());
sb.append("{");
sb.append("\"time\": ").append(System.currentTimeMillis()).append(",");
sb.append("\"appId\": \"").append(appId).append("\"");
for(String metric : this.schedulerMetrics.getAppTrackedMetrics()) {
String key = "variable.app." + appId + "." + metric;
sb.append(",\"").append(metric).append("\": ");
if (metrics.getGauges().containsKey(key)) {
double memoryGB =
Double.parseDouble(
metrics.getGauges().get(key).getValue().toString())
/ 1024;
sb.append(memoryGB);
} else {
sb.append(-1);
}
}
sb.append("}");
} else if(para.startsWith("Queue ")) {
String queueName = para.substring("Queue ".length());
sb.append("{");
sb.append("\"time\": ").append(System.currentTimeMillis()).append(",");
sb.append("\"queueName\": \"").append(queueName).append("\"");
for(String metric : this.schedulerMetrics.getQueueTrackedMetrics()) {
String key = "variable.queue." + queueName + "." + metric;
sb.append(",\"").append(metric).append("\": ");
if (metrics.getGauges().containsKey(key)) {
double memoryGB =
Double.parseDouble(
metrics.getGauges().get(key).getValue().toString())
/ 1024;
sb.append(memoryGB);
} else {
sb.append(-1);
}
}
sb.append("}");
}
}
String output = sb.toString();
if (output.isEmpty()) {
output = "[]";
}
response.getWriter().println(output);
// package result
((Request) request).setHandled(true);
}
}
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