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18 package org.apache.hadoop.chukwa.datacollection.collector;
19
20 import junit.framework.TestCase;
21 import org.apache.hadoop.chukwa.datacollection.agent.ChukwaAgent;
22 import org.apache.hadoop.chukwa.datacollection.collector.servlet.ServletCollector;
23 import org.apache.hadoop.chukwa.datacollection.connector.http.HttpConnector;
24 import org.apache.hadoop.chukwa.datacollection.sender.RetryListOfCollectors;
25 import org.apache.hadoop.chukwa.datacollection.writer.NullWriter;
26 import org.apache.hadoop.chukwa.datacollection.writer.PipelineStageWriter;
27 import org.apache.hadoop.chukwa.util.ConstRateAdaptor;
28 import org.apache.hadoop.conf.Configuration;
29 import org.mortbay.jetty.Server;
30 import org.mortbay.jetty.servlet.Context;
31 import org.mortbay.jetty.servlet.ServletHolder;
32
33 public class TestBackpressure extends TestCase {
34
35 int PORTNO = 9991;
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39
40
41
42 int TEST_DURATION_SECS = 40;
43 int WRITE_RATE_KB = 200;
44
45
46 int SEND_RATE = 2500* 1000;
47 int MIN_ACCEPTABLE_PERCENT = 60;
48
49 public void testBackpressure() throws Exception {
50 Configuration conf = new Configuration();
51 conf.set("chukwaCollector.writerClass", NullWriter.class
52 .getCanonicalName());
53 conf.set(NullWriter.RATE_OPT_NAME, ""+WRITE_RATE_KB);
54 conf.setInt(HttpConnector.MIN_POST_INTERVAL_OPT, 100);
55 conf.setInt("constAdaptor.sleepVariance", 1);
56 conf.setInt("constAdaptor.minSleep", 50);
57
58 conf.setInt("chukwaAgent.control.port", 0);
59 ChukwaAgent agent = new ChukwaAgent(conf);
60 RetryListOfCollectors clist = new RetryListOfCollectors(conf);
61 clist.add("http://localhost:"+PORTNO+"/chukwa");
62 HttpConnector conn = new HttpConnector(agent);
63 conn.setCollectors(clist);
64 conn.start();
65 Server server = new Server(PORTNO);
66 Context root = new Context(server, "/", Context.SESSIONS);
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68 root.addServlet(new ServletHolder(new ServletCollector(conf)), "/*");
69 server.start();
70 server.setStopAtShutdown(false);
71 Thread.sleep(1000);
72 agent.processAddCommand("add adaptor_constSend = " + ConstRateAdaptor.class.getCanonicalName() +
73 " testData "+ SEND_RATE + " 0");
74 assertNotNull(agent.getAdaptor("adaptor_constSend"));
75 Thread.sleep(TEST_DURATION_SECS * 1000);
76
77 String[] stat = agent.getAdaptorList().get("adaptor_constSend").split(" ");
78 long kbytesPerSec = Long.valueOf(stat[stat.length -1]) / TEST_DURATION_SECS / 1000;
79 System.out.println("data rate was " + kbytesPerSec + " kb /second");
80 assertTrue(kbytesPerSec < WRITE_RATE_KB);
81 assertTrue(kbytesPerSec > MIN_ACCEPTABLE_PERCENT* WRITE_RATE_KB / 100);
82 agent.shutdown();
83 }
84 }