Examples with TestNetwork org.neo4j.causalclustering.messaging.TestNetwork used on opensource projects

Example 1 with TestNetwork

use of org.neo4j.causalclustering.messaging.TestNetwork in project neo4j by neo4j.

the class ElectionPerformanceIT method electionPerformance_NormalConditions.

@Test
public void electionPerformance_NormalConditions() throws Throwable {
    /* This test runs with with few iterations. Hence it does not have the power to catch
         * regressions efficiently. Its purpose is mainly to run elections using real-world
         * parameters and catch very obvious regressions while not contributing overly much to the
         * regression test suites total runtime. */
    // given parameters
    final long networkLatency = 15L;
    final long electionTimeout = 500L;
    final long heartbeatInterval = 250L;
    final int iterations = 10;
    TestNetwork net = new TestNetwork<>((i, o) -> networkLatency);
    Set<MemberId> members = asSet(member(0), member(1), member(2));
    Fixture fixture = new Fixture(members, net, electionTimeout, heartbeatInterval);
    DisconnectLeaderScenario scenario = new DisconnectLeaderScenario(fixture, electionTimeout);
    try {
        // when running scenario
        fixture.boot();
        scenario.run(iterations, 10 * electionTimeout);
    } finally {
        fixture.tearDown();
    }
    DisconnectLeaderScenario.Result result = scenario.result();
    /* These bounds have been experimentally established and should have a very low
         * likelihood for false positives without an actual major regression. If this test fails
         * then the recommended action is to run the test manually and interpret the results
         * to guide further action. Perhaps the power of the test has to be improved, but
         * the intention here is not to catch anything but the most major of regressions. */
    assertThat(result.nonCollidingAverage, lessThan(2.0 * electionTimeout));
    if (result.collisionCount > 3) {
        assertThat(result.collidingAverage, lessThan(6.0 * electionTimeout));
    }
    assertThat(result.timeoutCount, is(0L));
}

Example 2 with TestNetwork

use of org.neo4j.causalclustering.messaging.TestNetwork in project neo4j by neo4j.

the class ElectionPerformanceIT method electionPerformance_RapidConditions.

@Test
public void electionPerformance_RapidConditions() throws Throwable {
    // given parameters
    final long networkLatency = 1L;
    final long electionTimeout = 30L;
    final long heartbeatInterval = 15L;
    final int iterations = 100;
    TestNetwork net = new TestNetwork<>((i, o) -> networkLatency);
    Set<MemberId> members = asSet(member(0), member(1), member(2));
    Fixture fixture = new Fixture(members, net, electionTimeout, heartbeatInterval);
    DisconnectLeaderScenario scenario = new DisconnectLeaderScenario(fixture, electionTimeout);
    try {
        // when running scenario
        fixture.boot();
        scenario.run(iterations, 10 * electionTimeout);
    } finally {
        fixture.tearDown();
    }
    DisconnectLeaderScenario.Result result = scenario.result();
    /* These bounds have been experimentally established and should have a very low
         * likelihood for false positives without an actual major regression. If this test fails
         * then the recommended action is to run the test manually and interpret the results
         * to guide further action. Perhaps the power of the test has to be improved, but
         * the intention here is not to catch anything but the most major of regressions. */
    assertThat(result.nonCollidingAverage, lessThan(2.0 * electionTimeout));
    // because of the high number of iterations, it is possible to assert on the collision rate
    assertThat(result.collisionRate, lessThan(0.50d));
    if (result.collisionCount > 10) {
        assertThat(result.collidingAverage, lessThan(5.0 * electionTimeout));
    }
    // for GC or whatever reason
    assertThat(result.timeoutCount, lessThanOrEqualTo(1L));
}