Examples with HighAvailabilityMemberChangeEvent org.neo4j.kernel.ha.cluster.HighAvailabilityMemberChangeEvent used on opensource projects

Example 1 with HighAvailabilityMemberChangeEvent

use of org.neo4j.kernel.ha.cluster.HighAvailabilityMemberChangeEvent in project neo4j by neo4j.

the class HighAvailabilityModeSwitcherTest method shouldUseProperServerIdWhenDemotingFromMasterOnException.

@Test
public void shouldUseProperServerIdWhenDemotingFromMasterOnException() throws Throwable {
    /*
         * This a test that acts as a driver to prove a bug which had an instance send out a demote message
         * with instance id -1, since it used HAMS#getServerId(URI) with a URI coming from the NetworkReceiver binding
         * which did not contain the serverId URI argument. This has been fixed by explicitly adding the instanceid
         * as a constructor argument of the HAMS.
         */
    // Given
    SwitchToSlaveCopyThenBranch sts = mock(SwitchToSlaveCopyThenBranch.class);
    SwitchToMaster stm = mock(SwitchToMaster.class);
    // this is necessary to trigger a revert which uses the serverId from the HAMS#me field
    when(stm.switchToMaster(any(LifeSupport.class), any(URI.class))).thenThrow(new RuntimeException());
    Election election = mock(Election.class);
    ClusterMemberAvailability cma = mock(ClusterMemberAvailability.class);
    InstanceId instanceId = new InstanceId(14);
    HighAvailabilityModeSwitcher theSwitcher = new HighAvailabilityModeSwitcher(sts, stm, election, cma, mock(ClusterClient.class), storeSupplierMock(), instanceId, new ComponentSwitcherContainer(), neoStoreDataSourceSupplierMock(), NullLogService.getInstance());
    theSwitcher.init();
    theSwitcher.start();
    /*
         * This is the trick, kind of. NetworkReceiver creates this and passes it on to NetworkReceiver#getURI() and
         * that
         * is what HAMS uses as the HAMS#me field value. But we should not be using this to extract the instanceId.
         * Note the lack of a serverId argument
         */
    URI listeningAt = URI.create("ha://0.0.0.0:5001?name=someName");
    theSwitcher.listeningAt(listeningAt);
    // When
    try {
        // the instance fails to switch to master
        theSwitcher.masterIsElected(new HighAvailabilityMemberChangeEvent(HighAvailabilityMemberState.PENDING, HighAvailabilityMemberState.TO_MASTER, instanceId, listeningAt));
    } finally {
        theSwitcher.stop();
        theSwitcher.shutdown();
    }
    // Then
    // The demotion message must have used the proper instance id
    verify(election).demote(instanceId);
}

Example 2 with HighAvailabilityMemberChangeEvent

use of org.neo4j.kernel.ha.cluster.HighAvailabilityMemberChangeEvent in project neo4j by neo4j.

the class HighAvailabilityModeSwitcherTest method shouldRecognizeNewMasterIfNewMasterBecameAvailableDuringSwitch.

@Test
public void shouldRecognizeNewMasterIfNewMasterBecameAvailableDuringSwitch() throws Throwable {
    // When messages coming in the following ordering, the slave should detect that the master id has changed
    // M1: Get masterIsAvailable for instance 1 at PENDING state, changing PENDING -> TO_SLAVE
    // M2: Get masterIsAvailable for instance 2 at TO_SLAVE state, changing TO_SLAVE -> TO_SLAVE
    // Given
    final CountDownLatch firstMasterAvailableHandled = new CountDownLatch(1);
    final CountDownLatch secondMasterAvailableComes = new CountDownLatch(1);
    final CountDownLatch secondMasterAvailableHandled = new CountDownLatch(1);
    SwitchToSlaveCopyThenBranch switchToSlave = mock(SwitchToSlaveCopyThenBranch.class);
    HighAvailabilityModeSwitcher modeSwitcher = new HighAvailabilityModeSwitcher(switchToSlave, mock(SwitchToMaster.class), mock(Election.class), mock(ClusterMemberAvailability.class), mock(ClusterClient.class), mock(Supplier.class), new InstanceId(4), new ComponentSwitcherContainer(), neoStoreDataSourceSupplierMock(), NullLogService.getInstance()) {

        @Override
        ScheduledExecutorService createExecutor() {
            final ScheduledExecutorService executor = mock(ScheduledExecutorService.class);
            final ExecutorService realExecutor = Executors.newSingleThreadExecutor();
            when(executor.submit(any(Runnable.class))).thenAnswer((Answer<Future<?>>) invocation -> realExecutor.submit((Runnable) () -> ((Runnable) invocation.getArguments()[0]).run()));
            when(executor.schedule(any(Runnable.class), anyLong(), any(TimeUnit.class))).thenAnswer((Answer<Future<?>>) invocation -> {
                realExecutor.submit((Callable<Void>) () -> {
                    firstMasterAvailableHandled.countDown();
                    secondMasterAvailableComes.await();
                    ((Runnable) invocation.getArguments()[0]).run();
                    secondMasterAvailableHandled.countDown();
                    return null;
                });
                return mock(ScheduledFuture.class);
            });
            return executor;
        }
    };
    modeSwitcher.init();
    modeSwitcher.start();
    modeSwitcher.listeningAt(URI.create("ha://server3?serverId=3"));
    // When
    // masterIsAvailable for instance 1
    URI uri1 = URI.create("ha://server1");
    // The first masterIsAvailable should fail so that the slave instance stops at TO_SLAVE state
    doThrow(new ComException("Fail to switch to slave and reschedule to retry")).when(switchToSlave).switchToSlave(any(LifeSupport.class), any(URI.class), eq(uri1), any(CancellationRequest.class));
    modeSwitcher.masterIsAvailable(new HighAvailabilityMemberChangeEvent(PENDING, TO_SLAVE, new InstanceId(1), uri1));
    // wait until the first masterIsAvailable triggers the exception handling
    firstMasterAvailableHandled.await();
    verify(switchToSlave).switchToSlave(any(LifeSupport.class), any(URI.class), eq(uri1), any(CancellationRequest.class));
    // masterIsAvailable for instance 2
    URI uri2 = URI.create("ha://server2");
    modeSwitcher.masterIsAvailable(new HighAvailabilityMemberChangeEvent(TO_SLAVE, TO_SLAVE, new InstanceId(2), uri2));
    secondMasterAvailableComes.countDown();
    // wait until switchToSlave method is invoked again
    secondMasterAvailableHandled.await();
    // Then
    // switchToSlave should be retried with new master id
    verify(switchToSlave).switchToSlave(any(LifeSupport.class), any(URI.class), eq(uri2), any(CancellationRequest.class));
}

Example 3 with HighAvailabilityMemberChangeEvent

use of org.neo4j.kernel.ha.cluster.HighAvailabilityMemberChangeEvent in project neo4j by neo4j.

the class HighAvailabilityModeSwitcherTest method shouldTakeNoActionIfSwitchingToSlaveForItselfAsMaster.

@Test
public void shouldTakeNoActionIfSwitchingToSlaveForItselfAsMaster() throws Throwable {
    // Given
    // A HAMS
    SwitchToSlaveCopyThenBranch switchToSlave = mock(SwitchToSlaveCopyThenBranch.class);
    AssertableLogProvider logProvider = new AssertableLogProvider();
    SimpleLogService logService = new SimpleLogService(NullLogProvider.getInstance(), logProvider);
    HighAvailabilityModeSwitcher toTest = new HighAvailabilityModeSwitcher(switchToSlave, mock(SwitchToMaster.class), mock(Election.class), mock(ClusterMemberAvailability.class), mock(ClusterClient.class), storeSupplierMock(), new InstanceId(2), new ComponentSwitcherContainer(), neoStoreDataSourceSupplierMock(), logService);
    // That is properly started
    toTest.init();
    toTest.start();
    /*
         * This is the URI at which we are registered as server - includes our own id, but we don't necessarily listen
         * there
         */
    URI serverHaUri = URI.create("ha://server2?serverId=2");
    toTest.listeningAt(serverHaUri);
    // When
    // The HAMS tries to switch to slave for a master that is itself
    toTest.masterIsAvailable(new HighAvailabilityMemberChangeEvent(PENDING, TO_SLAVE, new InstanceId(2), serverHaUri));
    // Then
    // No switching to slave must happen
    verifyZeroInteractions(switchToSlave);
    // And an error must be logged
    logProvider.assertAtLeastOnce(inLog(HighAvailabilityModeSwitcher.class).error("I (ha://server2?serverId=2) tried to switch to " + "slave for myself as master (ha://server2?serverId=2)"));
}

Example 4 with HighAvailabilityMemberChangeEvent

use of org.neo4j.kernel.ha.cluster.HighAvailabilityMemberChangeEvent in project neo4j by neo4j.

the class HighAvailabilityModeSwitcherTest method shouldNotBroadcastIfSlaveAndReceivesMasterIsElected.

@Test
public void shouldNotBroadcastIfSlaveAndReceivesMasterIsElected() throws Exception {
    // Given
    ClusterMemberAvailability availability = mock(ClusterMemberAvailability.class);
    HighAvailabilityModeSwitcher toTest = createModeSwitcher(availability);
    // When
    toTest.masterIsElected(new HighAvailabilityMemberChangeEvent(HighAvailabilityMemberState.SLAVE, HighAvailabilityMemberState.SLAVE, new InstanceId(2), URI.create("ha://someone")));
    // Then
    /*
           * The second argument to memberIsAvailable below is null because it has not been set yet. This would require
           * a switch to master which we don't do here.
           */
    verifyZeroInteractions(availability);
}

Example 5 with HighAvailabilityMemberChangeEvent

use of org.neo4j.kernel.ha.cluster.HighAvailabilityMemberChangeEvent in project neo4j by neo4j.

the class HighAvailabilityModeSwitcherTest method shouldNotBroadcastIfMasterAndReceivesSlaveIsAvailable.

@Test
public void shouldNotBroadcastIfMasterAndReceivesSlaveIsAvailable() throws Exception {
    // Given
    ClusterMemberAvailability availability = mock(ClusterMemberAvailability.class);
    HighAvailabilityModeSwitcher toTest = createModeSwitcher(availability);
    // When
    toTest.slaveIsAvailable(new HighAvailabilityMemberChangeEvent(HighAvailabilityMemberState.MASTER, HighAvailabilityMemberState.MASTER, new InstanceId(2), URI.create("ha://someone")));
    // Then
    /*
           * The second argument to memberIsAvailable below is null because it has not been set yet. This would require
           * a switch to master which we don't do here.
           */
    verifyZeroInteractions(availability);
}