NFD

Bug #2403

Updated by Junxiao Shi over 9 years ago

Test case to reproduce: 

 ``` 
 BOOST_FIXTURE_TEST_CASE(Overhead, TwoLaptopsFixture) 
 { 
   /* 
    *               /------------------\                                /------------------\ 
    *               | intervalConsumer |                                | intervalConsumer | 
    *               \------------------/                A                 \------------------/ 
    *                        ^ v                        f                          ^ v 
    *                        | v /laptops/M             t                          | v /laptops/M 
    *                        |                          e                          | 
    *                        v                          r                          v 
    *        /laptops << +--------+ >> /laptops                  /laptops << +--------+ >> /laptops 
    *             +----->| router |<------+             1               +----->| router |<------+ 
    *             |        +--------+         |                           |        +--------+         | 
    *        10ms |                         | 20ms    === s ==>      10ms |                         | 20ms 
    *             v                         v             e               v                         v 
    *        +---------+               +---------+        c          +---------+               +---------+ 
    *        | laptopA |               | laptopB |        o          | laptopA |               | laptopB | 
    *        +---------+               +---------+        n          +---------+               +---------+ 
    *             ^    v                                  d 
    *             |    v /laptops/M 
    *             v 
    *      /--------------\ 
    *      | echoProducer | 
    *      \--------------/ 
    */ 

   // laptopA has prefix in router FIB; laptopB is unused in this test case 
   topo.registerPrefix(router, linkA->getFace(router), "ndn:/laptops"); 
   topo.registerPrefix(router, linkB->getFace(router), "ndn:/laptops"); 

   shared_ptr<TopologyAppLink> producerA = topo.addAppFace(laptopA, "ndn:/laptops/A"); 
   topo.addEchoProducer(*producerA->getClientFace()); 

   // to build up "correct" RTO value 
   shared_ptr<TopologyAppLink> consumer = topo.addAppFace(router); 
   topo.addIntervalConsumer(*consumer->getClientFace(), "ndn:/laptops/A", 
                            time::milliseconds(10), 100); 
   this->advanceClocks(time::milliseconds(1), time::seconds(1)); 

   auto me = topo.getForwarder(router).getMeasurements().findLongestPrefixMatch("ndn:/laptops/A"); 
   BOOST_REQUIRE(me != nullptr); 

   auto mi = me->getStrategyInfo<fw::AccessStrategy::MtInfo>(); 
   BOOST_REQUIRE(mi != nullptr); 

   auto rto = mi->rtt.computeRto(); 
   BOOST_CHECK(time::milliseconds(10) < rto && rto < time::milliseconds(30)); 

   BOOST_CHECK_EQUAL(linkA->getFace(router)->m_sentInterests.size(), 100); 
   BOOST_CHECK_EQUAL(linkA->getFace(laptopA)->m_sentDatas.size(), 100); 
   BOOST_CHECK_EQUAL(linkB->getFace(router)->m_sentInterests.size(), 3); 

   linkA->getFace(router)->m_sentInterests.clear(); 
   linkA->getFace(laptopA)->m_sentDatas.clear(); 
   linkB->getFace(router)->m_sentInterests.clear(); 

   // actual test 
   producerA->fail(); 

   topo.addIntervalConsumer(*consumer->getClientFace(), "ndn:/laptops/A", 
                            time::milliseconds(31), 10); 

   // unicast to laptopA 
   this->advanceClocks(time::milliseconds(1), time::milliseconds(10)); 
   BOOST_CHECK_EQUAL(linkA->getFace(router)->m_sentInterests.size(), 1); 
   BOOST_CHECK_EQUAL(linkB->getFace(router)->m_sentInterests.size(), 0); 

   // multicast 
   this->advanceClocks(time::milliseconds(1), time::milliseconds(20)); 
   BOOST_CHECK_EQUAL(linkA->getFace(router)->m_sentInterests.size(), 1); 
   BOOST_CHECK_EQUAL(linkB->getFace(router)->m_sentInterests.size(), 1); 

   // unicast to laptopA 
   this->advanceClocks(time::milliseconds(1), time::milliseconds(10)); 
   BOOST_CHECK_EQUAL(linkA->getFace(router)->m_sentInterests.size(), 2); 
   BOOST_CHECK_EQUAL(linkB->getFace(router)->m_sentInterests.size(), 1); 

   // multicast 
   this->advanceClocks(time::milliseconds(1), time::milliseconds(20)); 
   BOOST_CHECK_EQUAL(linkA->getFace(router)->m_sentInterests.size(), 2); 
   BOOST_CHECK_EQUAL(linkB->getFace(router)->m_sentInterests.size(), 2); 

   // unicast to laptopA 
   this->advanceClocks(time::milliseconds(1), time::milliseconds(10)); 
   BOOST_CHECK_EQUAL(linkA->getFace(router)->m_sentInterests.size(), 3); 
   BOOST_CHECK_EQUAL(linkB->getFace(router)->m_sentInterests.size(), 2); 

   // multicast 
   this->advanceClocks(time::milliseconds(1), time::milliseconds(20)); 
   BOOST_CHECK_EQUAL(linkA->getFace(router)->m_sentInterests.size(), 3); 
   BOOST_CHECK_EQUAL(linkB->getFace(router)->m_sentInterests.size(), 3); 

   this->advanceClocks(time::milliseconds(5), time::seconds(1)); 

   BOOST_CHECK_EQUAL(linkA->getFace(router)->m_sentInterests.size(), 10); 
   BOOST_CHECK_EQUAL(linkB->getFace(router)->m_sentInterests.size(), 10); 

   this->advanceClocks(time::milliseconds(5), time::seconds(5)); 

   // all consumers should be done more than 4 seconds ago 
   me = topo.getForwarder(router).getMeasurements().findLongestPrefixMatch("ndn:/laptops/A"); 
   BOOST_CHECK(me == nullptr); 
 } 
 ``` 

 Actual: (as shown in test assertions) after producer failure, Interests are unicasted to where the producer was, and then multicasted after an RTO. This continues until MeasurementsEntry expires. RTO   
 Expected: after producer failure, Interests are multicasted right away. away

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