Examples with CoreClusterMember org.neo4j.causalclustering.discovery.CoreClusterMember used on opensource projects

Example 1 with CoreClusterMember

use of org.neo4j.causalclustering.discovery.CoreClusterMember in project neo4j by neo4j.

the class BoltCausalClusteringIT method sessionShouldExpireOnLeaderSwitch.

@Test
public void sessionShouldExpireOnLeaderSwitch() throws Exception {
    // given
    cluster = clusterRule.withNumberOfReadReplicas(0).startCluster();
    CoreClusterMember leader = cluster.awaitLeader();
    Driver driver = GraphDatabase.driver(leader.routingURI(), AuthTokens.basic("neo4j", "neo4j"));
    try (Session session = driver.session()) {
        session.run("CREATE (n:Person {name: 'Jim'})").consume();
        // when
        switchLeader(leader);
        session.run("CREATE (n:Person {name: 'Mark'})").consume();
        fail("Should have thrown exception");
    } catch (SessionExpiredException sep) {
        // then
        assertEquals(String.format("Server at %s no longer accepts writes", leader.boltAdvertisedAddress()), sep.getMessage());
    } finally {
        driver.close();
    }
}

Example 2 with CoreClusterMember

use of org.neo4j.causalclustering.discovery.CoreClusterMember in project neo4j by neo4j.

the class BoltCausalClusteringIT method shouldSendRequestsToNewlyAddedReadReplicas.

@Test
public void shouldSendRequestsToNewlyAddedReadReplicas() throws Throwable {
    // given
    cluster = clusterRule.withNumberOfReadReplicas(1).withSharedCoreParams(stringMap(CausalClusteringSettings.cluster_routing_ttl.name(), "1s")).startCluster();
    CoreClusterMember leader = cluster.awaitLeader();
    Driver driver = GraphDatabase.driver(leader.routingURI(), AuthTokens.basic("neo4j", "neo4j"));
    String bookmark = inExpirableSession(driver, (d) -> d.session(AccessMode.WRITE), (session) -> {
        try (Transaction tx = session.beginTransaction()) {
            tx.run("CREATE (p:Person {name: {name} })", Values.parameters("name", "Jim"));
            tx.success();
        }
        return session.lastBookmark();
    });
    // when
    Set<String> readReplicas = new HashSet<>();
    for (ReadReplica readReplica : cluster.readReplicas()) {
        readReplicas.add(readReplica.boltAdvertisedAddress());
    }
    for (int i = 10; i <= 13; i++) {
        ReadReplica newReadReplica = cluster.addReadReplicaWithId(i);
        readReplicas.add(newReadReplica.boltAdvertisedAddress());
        newReadReplica.start();
    }
    assertEventually("Failed to send requests to all servers", () -> {
        for (// don't care about cores
        int i = 0; // don't care about cores
        i < cluster.readReplicas().size(); // don't care about cores
        i++) {
            try (Session session = driver.session(AccessMode.READ)) {
                BoltServerAddress boltServerAddress = ((RoutingNetworkSession) session).address();
                executeReadQuery(bookmark, session);
                readReplicas.remove(boltServerAddress.toString());
            } catch (Throwable throwable) {
                return false;
            }
        }
        // have sent something to all replicas
        return readReplicas.size() == 0;
    }, is(true), 30, SECONDS);
}

Example 3 with CoreClusterMember

use of org.neo4j.causalclustering.discovery.CoreClusterMember in project neo4j by neo4j.

the class BoltCausalClusteringIT method shouldUseBookmarkFromAWriteSessionInAReadSession.

@Test
public void shouldUseBookmarkFromAWriteSessionInAReadSession() throws Throwable {
    // given
    cluster = clusterRule.withNumberOfReadReplicas(1).startCluster();
    CoreClusterMember leader = cluster.awaitLeader();
    ReadReplica readReplica = cluster.getReadReplicaById(0);
    readReplica.txPollingClient().stop();
    Driver driver = GraphDatabase.driver(leader.directURI(), AuthTokens.basic("neo4j", "neo4j"));
    String bookmark = inExpirableSession(driver, (d) -> d.session(AccessMode.WRITE), (session) -> {
        try (Transaction tx = session.beginTransaction()) {
            tx.run("CREATE (p:Person {name: {name} })", Values.parameters("name", "Jim"));
            tx.run("CREATE (p:Person {name: {name} })", Values.parameters("name", "Alistair"));
            tx.run("CREATE (p:Person {name: {name} })", Values.parameters("name", "Mark"));
            tx.run("CREATE (p:Person {name: {name} })", Values.parameters("name", "Chris"));
            tx.success();
        }
        return session.lastBookmark();
    });
    assertNotNull(bookmark);
    readReplica.txPollingClient().start();
    driver = GraphDatabase.driver(readReplica.directURI(), AuthTokens.basic("neo4j", "neo4j"));
    try (Session session = driver.session(AccessMode.READ)) {
        try (Transaction tx = session.beginTransaction(bookmark)) {
            Record record = tx.run("MATCH (n:Person) RETURN COUNT(*) AS count").next();
            tx.success();
            assertEquals(4, record.get("count").asInt());
        }
    }
}

Example 4 with CoreClusterMember

use of org.neo4j.causalclustering.discovery.CoreClusterMember in project neo4j by neo4j.

the class BoltCausalClusteringIT method shouldHandleLeaderSwitch.

@Test
public void shouldHandleLeaderSwitch() throws Exception {
    // given
    cluster = clusterRule.startCluster();
    CoreClusterMember leader = cluster.awaitLeader();
    try (Driver driver = GraphDatabase.driver(leader.routingURI(), AuthTokens.basic("neo4j", "neo4j"))) {
        // when
        try (Session session = driver.session()) {
            try (Transaction tx = session.beginTransaction()) {
                switchLeader(leader);
                tx.run("CREATE (person:Person {name: {name}, title: {title}})", parameters("name", "Webber", "title", "Mr"));
                tx.success();
            } catch (SessionExpiredException ignored) {
            // expected
            }
        }
        String bookmark = inExpirableSession(driver, Driver::session, s -> {
            try (Transaction tx = s.beginTransaction()) {
                tx.run("CREATE (person:Person {name: {name}, title: {title}})", parameters("name", "Webber", "title", "Mr"));
                tx.success();
            } catch (SessionExpiredException ignored) {
            }
            return s.lastBookmark();
        });
        // then
        try (Session session = driver.session(AccessMode.READ)) {
            try (Transaction tx = session.beginTransaction(bookmark)) {
                Record record = tx.run("MATCH (n:Person) RETURN COUNT(*) AS count").next();
                tx.success();
                assertEquals(1, record.get("count").asInt());
            }
        }
    }
}

Example 5 with CoreClusterMember

use of org.neo4j.causalclustering.discovery.CoreClusterMember in project neo4j by neo4j.

the class BoltCausalClusteringIT method shouldReadAndWriteToANewSessionCreatedAfterALeaderSwitch.

/*
       Create a session with empty arg list (no AccessMode arg), in a driver that was initialized with a bolt+routing
       URI, and ensure that it
       a) works against the Leader for reads and writes before a leader switch, and
       b) receives a SESSION EXPIRED after a leader switch, and
       c) keeps working if a new session is created after that exception, again with no access mode specified.
     */
@Test
public void shouldReadAndWriteToANewSessionCreatedAfterALeaderSwitch() throws Exception {
    // given
    cluster = clusterRule.withNumberOfReadReplicas(1).startCluster();
    CoreClusterMember leader = cluster.awaitLeader();
    try (Driver driver = GraphDatabase.driver(leader.routingURI(), AuthTokens.basic("neo4j", "neo4j"))) {
        inExpirableSession(driver, Driver::session, (session) -> {
            // execute a write/read query
            session.run("CREATE (p:Person {name: {name} })", Values.parameters("name", "Jim"));
            Record record = session.run("MATCH (n:Person) RETURN COUNT(*) AS count").next();
            assertEquals(1, record.get("count").asInt());
            try {
                switchLeader(leader);
                session.run("CREATE (p:Person {name: {name} })").consume();
                fail("Should have thrown an exception as the leader went away mid session");
            } catch (SessionExpiredException sep) {
                // then
                assertEquals(String.format("Server at %s no longer accepts writes", leader.boltAdvertisedAddress()), sep.getMessage());
            } catch (InterruptedException e) {
            // ignored
            }
            return null;
        });
        inExpirableSession(driver, Driver::session, (session) -> {
            // execute a write/read query
            session.run("CREATE (p:Person {name: {name} })", Values.parameters("name", "Jim"));
            Record record = session.run("MATCH (n:Person) RETURN COUNT(*) AS count").next();
            assertEquals(2, record.get("count").asInt());
            return null;
        });
    }
}