| package org.apache.helix.controller.rebalancer.waged; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| |
| import org.apache.helix.AccessOption; |
| import org.apache.helix.HelixManager; |
| import org.apache.helix.HelixManagerFactory; |
| import org.apache.helix.InstanceType; |
| import org.apache.helix.common.ZkTestBase; |
| import org.apache.helix.integration.manager.ClusterControllerManager; |
| import org.apache.helix.integration.manager.MockParticipantManager; |
| import org.apache.helix.model.Partition; |
| import org.apache.helix.model.ResourceAssignment; |
| import org.testng.Assert; |
| import org.testng.annotations.AfterClass; |
| import org.testng.annotations.BeforeClass; |
| import org.testng.annotations.Test; |
| |
| |
| public class TestAssignmentMetadataStore extends ZkTestBase { |
| protected static final int NODE_NR = 5; |
| protected static final int START_PORT = 12918; |
| protected static final String STATE_MODEL = "MasterSlave"; |
| protected static final String TEST_DB = "TestDB"; |
| protected static final int _PARTITIONS = 20; |
| |
| protected HelixManager _manager; |
| protected final String CLASS_NAME = getShortClassName(); |
| protected final String CLUSTER_NAME = CLUSTER_PREFIX + "_" + CLASS_NAME; |
| |
| protected MockParticipantManager[] _participants = new MockParticipantManager[NODE_NR]; |
| protected ClusterControllerManager _controller; |
| protected int _replica = 3; |
| |
| private AssignmentMetadataStore _store; |
| |
| @BeforeClass |
| public void beforeClass() |
| throws Exception { |
| super.beforeClass(); |
| |
| // setup storage cluster |
| _gSetupTool.addCluster(CLUSTER_NAME, true); |
| _gSetupTool.addResourceToCluster(CLUSTER_NAME, TEST_DB, _PARTITIONS, STATE_MODEL); |
| for (int i = 0; i < NODE_NR; i++) { |
| String storageNodeName = PARTICIPANT_PREFIX + "_" + (START_PORT + i); |
| _gSetupTool.addInstanceToCluster(CLUSTER_NAME, storageNodeName); |
| } |
| _gSetupTool.rebalanceStorageCluster(CLUSTER_NAME, TEST_DB, _replica); |
| |
| // start dummy participants |
| for (int i = 0; i < NODE_NR; i++) { |
| String instanceName = PARTICIPANT_PREFIX + "_" + (START_PORT + i); |
| _participants[i] = new MockParticipantManager(ZK_ADDR, CLUSTER_NAME, instanceName); |
| _participants[i].syncStart(); |
| } |
| |
| // start controller |
| String controllerName = CONTROLLER_PREFIX + "_0"; |
| _controller = new ClusterControllerManager(ZK_ADDR, CLUSTER_NAME, controllerName); |
| _controller.syncStart(); |
| |
| // create cluster manager |
| _manager = HelixManagerFactory |
| .getZKHelixManager(CLUSTER_NAME, "Admin", InstanceType.ADMINISTRATOR, ZK_ADDR); |
| _manager.connect(); |
| |
| // create AssignmentMetadataStore |
| _store = new AssignmentMetadataStore(_manager.getMetadataStoreConnectionString(), |
| _manager.getClusterName()); |
| } |
| |
| @AfterClass |
| public void afterClass() { |
| if (_store != null) { |
| _store.close(); |
| } |
| } |
| |
| /** |
| * TODO: Reading baseline will be empty because AssignmentMetadataStore isn't being used yet by |
| * the new rebalancer. Modify this integration test once the WAGED rebalancer |
| * starts using AssignmentMetadataStore's persist APIs. |
| * TODO: WAGED Rebalancer currently does NOT work with ZKClusterVerifier because verifier's |
| * HelixManager is null, and that causes an NPE when instantiating AssignmentMetadataStore. |
| */ |
| @Test |
| public void testReadEmptyBaseline() { |
| Map<String, ResourceAssignment> baseline = _store.getBaseline(); |
| Assert.assertTrue(baseline.isEmpty()); |
| } |
| |
| /** |
| * Test that if the old assignment and new assignment are the same, |
| */ |
| @Test(dependsOnMethods = "testReadEmptyBaseline") |
| public void testAvoidingRedundantWrite() { |
| String baselineKey = "BASELINE"; |
| String bestPossibleKey = "BEST_POSSIBLE"; |
| |
| // Generate a dummy assignment |
| Map<String, ResourceAssignment> dummyAssignment = new HashMap<>(); |
| ResourceAssignment assignment = new ResourceAssignment(TEST_DB); |
| Partition partition = new Partition(TEST_DB); |
| Map<String, String> replicaMap = new HashMap<>(); |
| replicaMap.put(TEST_DB, TEST_DB); |
| assignment.addReplicaMap(partition, replicaMap); |
| dummyAssignment.put(TEST_DB, new ResourceAssignment(TEST_DB)); |
| |
| // Call persist functions |
| _store.persistBaseline(dummyAssignment); |
| _store.persistBestPossibleAssignment(dummyAssignment); |
| |
| // Check that only one version exists |
| List<String> baselineVersions = getExistingVersionNumbers(baselineKey); |
| List<String> bestPossibleVersions = getExistingVersionNumbers(bestPossibleKey); |
| Assert.assertEquals(baselineVersions.size(), 1); |
| Assert.assertEquals(bestPossibleVersions.size(), 1); |
| |
| // Call persist functions again |
| _store.persistBaseline(dummyAssignment); |
| _store.persistBestPossibleAssignment(dummyAssignment); |
| |
| // Check that only one version exists still |
| baselineVersions = getExistingVersionNumbers(baselineKey); |
| bestPossibleVersions = getExistingVersionNumbers(bestPossibleKey); |
| Assert.assertEquals(baselineVersions.size(), 1); |
| Assert.assertEquals(bestPossibleVersions.size(), 1); |
| } |
| |
| /** |
| * Returns a list of existing version numbers only. |
| * @param metadataType |
| * @return |
| */ |
| private List<String> getExistingVersionNumbers(String metadataType) { |
| List<String> children = _baseAccessor |
| .getChildNames("/" + CLUSTER_NAME + "/ASSIGNMENT_METADATA/" + metadataType, |
| AccessOption.PERSISTENT); |
| children.remove("LAST_SUCCESSFUL_WRITE"); |
| children.remove("LAST_WRITE"); |
| return children; |
| } |
| } |