| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.cassandra.sidecar.cluster; |
| |
| |
| import java.net.InetSocketAddress; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.TimeUnit; |
| import java.util.stream.Collectors; |
| |
| import com.google.common.util.concurrent.Uninterruptibles; |
| import org.junit.jupiter.api.Assertions; |
| |
| import com.datastax.driver.core.DriverUtils; |
| import com.datastax.driver.core.Host; |
| import org.apache.cassandra.distributed.UpgradeableCluster; |
| import org.apache.cassandra.distributed.api.IUpgradeableInstance; |
| import org.apache.cassandra.sidecar.cluster.instance.InstanceMetadata; |
| import org.apache.cassandra.sidecar.testing.IntegrationTestBase; |
| import org.apache.cassandra.testing.CassandraIntegrationTest; |
| |
| import static org.assertj.core.api.Assertions.assertThat; |
| |
| /** |
| * A test for the SidecarLoadBalancingPolicy |
| */ |
| public class SidecarLoadBalancingPolicyTest extends IntegrationTestBase |
| { |
| |
| public static final int SIDECAR_MANAGED_INSTANCES = 2; |
| |
| private static List<Host> getConnectedHosts(Set<Host> hosts) |
| { |
| return hosts.stream() |
| .filter(DriverUtils::hasActiveConnections) |
| .collect(Collectors.toList()); |
| } |
| |
| protected int getNumInstancesToManage(int clusterSize) |
| { |
| return SIDECAR_MANAGED_INSTANCES; // we only want to manage the first 2 instances in the "cluster" |
| } |
| |
| @CassandraIntegrationTest(nodesPerDc = 6) |
| public void shouldMaintainMinimumConnections() throws ExecutionException, InterruptedException |
| { |
| Set<Host> hosts = sidecarTestContext.session().getCluster().getMetadata().getAllHosts(); |
| List<Host> connectedHosts = getConnectedHosts(hosts); |
| // We manage 2 hosts, and ask for an additional 2 (the default) for connections. |
| // Therefore, we expect 4 hosts to have connections at startup. |
| int expectedConnections = SIDECAR_MANAGED_INSTANCES + SidecarLoadBalancingPolicy.MIN_NON_LOCAL_CONNECTIONS; |
| assertThat(connectedHosts.size()).isEqualTo(expectedConnections); |
| // Now, shut down one of the hosts and make sure that we connect to a different node |
| UpgradeableCluster cluster = sidecarTestContext.cluster(); |
| IUpgradeableInstance inst = shutDownNonLocalInstance(cluster, sidecarTestContext.instancesConfig().instances()); |
| assertThat(inst.isShutdown()).isTrue(); |
| InetSocketAddress downInstanceAddress = new InetSocketAddress(inst.broadcastAddress().getAddress(), |
| inst.config().getInt("native_transport_port")); |
| assertConnectionsWithRetry(downInstanceAddress, expectedConnections); |
| } |
| |
| private void assertConnectionsWithRetry(InetSocketAddress downInstanceAddress, int expectedConnections) |
| { |
| List<Host> connectedHosts = Collections.emptyList(); |
| int attempts = 0; |
| // Retry for up to 2 minutes, but passes much more quickly most of the time, so this should be safe. |
| while (attempts <= 24) |
| { |
| Set<Host> hosts = sidecarTestContext.session().getCluster().getMetadata().getAllHosts(); |
| connectedHosts = getConnectedHosts(hosts); |
| List<InetSocketAddress> connectedAddresses = getAddresses(connectedHosts); |
| if (connectedHosts.size() == expectedConnections && !connectedAddresses.contains(downInstanceAddress)) |
| { |
| return; |
| } |
| attempts++; |
| Uninterruptibles.sleepUninterruptibly(5, TimeUnit.SECONDS); |
| } |
| List<InetSocketAddress> connectedAddresses = getAddresses(connectedHosts); |
| assertThat(connectedAddresses).doesNotContain(downInstanceAddress); |
| if (connectedHosts.size() == expectedConnections) |
| { |
| return; |
| } |
| String message = |
| String.format("Waited 2 minutes for connected hosts (%d) to be the expected number (%d) but failed", |
| connectedHosts.size(), expectedConnections); |
| Assertions.fail(message); |
| } |
| |
| private List<InetSocketAddress> getAddresses(List<Host> connectedHosts) |
| { |
| return connectedHosts.stream() |
| .map(h -> h.getEndPoint().resolve()) |
| .collect(Collectors.toList()); |
| } |
| |
| private IUpgradeableInstance shutDownNonLocalInstance(UpgradeableCluster cluster, |
| List<InstanceMetadata> instances) |
| throws ExecutionException, InterruptedException |
| { |
| Set<InetSocketAddress> localInstances = instances.stream().map(i -> new InetSocketAddress(i.host(), i.port())) |
| .collect(Collectors.toSet()); |
| for (IUpgradeableInstance inst : cluster) |
| { |
| InetSocketAddress nativeAddress = new InetSocketAddress(inst.config().broadcastAddress().getAddress(), |
| inst.config().getInt("native_transport_port")); |
| if (localInstances.contains(nativeAddress)) |
| { |
| continue; |
| } |
| inst.shutdown(true).get(); |
| return inst; |
| } |
| throw new RuntimeException("Could not find instance to shut down"); |
| } |
| } |