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

Example 21 with ReadReplica

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

the class TransactionLogRecoveryIT method readReplicaShouldStartAfterPartialTransactionWriteCrash.

@Test
public void readReplicaShouldStartAfterPartialTransactionWriteCrash() throws Exception {
    // given: a fully synced cluster with some data
    dataMatchesEventually(createEmptyNodes(cluster, 10), cluster.readReplicas());
    // when: shutting down a read replica
    ReadReplica readReplica = cluster.getReadReplicaById(0);
    readReplica.shutdown();
    // and making sure there will be something new to pull
    CoreClusterMember lastWrites = createEmptyNodes(cluster, 10);
    dataMatchesEventually(lastWrites, cluster.coreMembers());
    // and writing a partial tx
    writePartialTx(readReplica.storeDir());
    // then: we should still be able to start
    readReplica.start();
    // and become fully synced again
    dataMatchesEventually(lastWrites, singletonList(readReplica));
}

Example 22 with ReadReplica

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

the class CoreEdgeMetricsIT method shouldMonitorCoreEdge.

@Test
public void shouldMonitorCoreEdge() throws Exception {
    // given
    cluster = clusterRule.startCluster();
    // when
    CoreGraphDatabase coreDB = cluster.awaitLeader(5, TimeUnit.SECONDS).database();
    try (Transaction tx = coreDB.beginTx()) {
        Node node = coreDB.createNode(label("boo"));
        node.setProperty("foobar", "baz_bat");
        tx.success();
    }
    // then
    for (CoreClusterMember db : cluster.coreMembers()) {
        assertAllNodesVisible(db.database());
    }
    for (ReadReplica db : cluster.readReplicas()) {
        assertAllNodesVisible(db.database());
    }
    File coreMetricsDir = new File(cluster.getCoreMemberById(0).homeDir(), csvPath.getDefaultValue());
    assertEventually("append index eventually accurate", () -> readLongValue(metricsCsv(coreMetricsDir, CoreMetrics.APPEND_INDEX)), greaterThan(0L), TIMEOUT, TimeUnit.SECONDS);
    assertEventually("commit index eventually accurate", () -> readLongValue(metricsCsv(coreMetricsDir, CoreMetrics.COMMIT_INDEX)), greaterThan(0L), TIMEOUT, TimeUnit.SECONDS);
    assertEventually("term eventually accurate", () -> readLongValue(metricsCsv(coreMetricsDir, CoreMetrics.TERM)), greaterThanOrEqualTo(0L), TIMEOUT, TimeUnit.SECONDS);
    assertEventually("leader not found eventually accurate", () -> readLongValue(metricsCsv(coreMetricsDir, CoreMetrics.LEADER_NOT_FOUND)), equalTo(0L), TIMEOUT, TimeUnit.SECONDS);
    assertEventually("tx pull requests received eventually accurate", () -> {
        long total = 0;
        for (final File homeDir : cluster.coreMembers().stream().map(CoreClusterMember::homeDir).collect(Collectors.toList())) {
            File metricsDir = new File(homeDir, "metrics");
            total += readLongValue(metricsCsv(metricsDir, CatchUpMetrics.TX_PULL_REQUESTS_RECEIVED));
        }
        return total;
    }, greaterThan(0L), TIMEOUT, TimeUnit.SECONDS);
    assertEventually("tx retries eventually accurate", () -> readLongValue(metricsCsv(coreMetricsDir, CoreMetrics.TX_RETRIES)), equalTo(0L), TIMEOUT, TimeUnit.SECONDS);
    assertEventually("is leader eventually accurate", () -> readLongValue(metricsCsv(coreMetricsDir, CoreMetrics.IS_LEADER)), greaterThanOrEqualTo(0L), TIMEOUT, TimeUnit.SECONDS);
    File readReplicaMetricsDir = new File(cluster.getReadReplicaById(0).homeDir(), "metrics");
    assertEventually("pull update request registered", () -> readLongValue(metricsCsv(readReplicaMetricsDir, PULL_UPDATES)), greaterThan(0L), TIMEOUT, TimeUnit.SECONDS);
    assertEventually("pull update request registered", () -> readLongValue(metricsCsv(readReplicaMetricsDir, PULL_UPDATE_HIGHEST_TX_ID_REQUESTED)), greaterThan(0L), TIMEOUT, TimeUnit.SECONDS);
    assertEventually("pull update response received", () -> readLongValue(metricsCsv(readReplicaMetricsDir, PULL_UPDATE_HIGHEST_TX_ID_RECEIVED)), greaterThan(0L), TIMEOUT, TimeUnit.SECONDS);
    assertEventually("dropped messages eventually accurate", () -> readLongValue(metricsCsv(coreMetricsDir, CoreMetrics.DROPPED_MESSAGES)), greaterThanOrEqualTo(0L), TIMEOUT, TimeUnit.SECONDS);
    assertEventually("queue size eventually accurate", () -> readLongValue(metricsCsv(coreMetricsDir, CoreMetrics.QUEUE_SIZE)), greaterThanOrEqualTo(0L), TIMEOUT, TimeUnit.SECONDS);
}