NSAmelchev commented on code in PR #12459: URL: https://github.com/apache/ignite/pull/12459#discussion_r2469741518
########## modules/core/src/test/java/org/apache/ignite/cache/affinity/rendezvous/MdcAffinityBackupFilterSelfTest.java: ########## @@ -0,0 +1,253 @@ +/* + * 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.ignite.cache.affinity.rendezvous; + +import java.util.Collection; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.stream.Collectors; +import org.apache.ignite.IgniteCache; +import org.apache.ignite.IgniteSystemProperties; +import org.apache.ignite.cache.affinity.Affinity; +import org.apache.ignite.cluster.ClusterNode; +import org.apache.ignite.configuration.IgniteConfiguration; +import org.apache.ignite.internal.IgniteEx; +import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest; +import org.junit.Test; + +/** + * Verifies behaviour of {@link MdcAffinityBackupFilter} - guarantees that each DC has at least one copy of every partition. + * Verified distribution uniformity in each DC separately. + */ +public class MdcAffinityBackupFilterSelfTest extends GridCommonAbstractTest { + /** */ + private static final int PARTS_CNT = 8; + + /** */ + private int backups; + + /** */ + private String[] dcIds; + + /** {@inheritDoc} */ + @Override protected IgniteConfiguration getConfiguration(String igniteInstanceName) throws Exception { + IgniteConfiguration cfg = super.getConfiguration(igniteInstanceName); + + cfg.setCacheConfiguration(defaultCacheConfiguration() + .setBackups(backups) + .setAffinity( + new RendezvousAffinityFunction(false, PARTS_CNT) + .setAffinityBackupFilter(new MdcAffinityBackupFilter(dcIds.length, backups)))); + + return cfg; + } + + /** {@inheritDoc} */ + @Override protected void afterTest() throws Exception { + super.afterTest(); + + stopAllGrids(); + } + + /** + * Verifies that {@link MdcAffinityBackupFilter} prohibits single data center deployment. + */ + @Test + public void testSingleDcDeploymentIsProhibited() { + dcIds = new String[] {"DC_0"}; + System.setProperty(IgniteSystemProperties.IGNITE_DATA_CENTER_ID, dcIds[0]); + + backups = 1; + verifyGridFailsToStartWithMessage("Number of datacenters must be at least 2."); + } + + /** + * Verifies that {@link MdcAffinityBackupFilter} enforces even number of partition copies per datacenter. + */ + @Test + public void testEvenNumberOfPartitionCopiesPerDcIsEnforced() { + dcIds = new String[] {"DC_0", "DC_1", "DC_2"}; + System.setProperty(IgniteSystemProperties.IGNITE_DATA_CENTER_ID, dcIds[0]); + + backups = 1; + verifyGridFailsToStartWithMessage("recommended value is 2"); + + backups = 7; + verifyGridFailsToStartWithMessage("recommended values are 5 and 8"); + } + + /** + * Verifies that partition copies are assigned evenly across a cluster in two data centers. + * <p/> + * When a node from one data center is stopped, partition distribution is that data center should stay uniform. + * + * @throws Exception If failed. + */ + @Test + public void test2DcDistribution() throws Exception { + dcIds = new String[] {"DC_0", "DC_1"}; + int nodesPerDc = 4; + backups = 3; + + IgniteEx srv = startClusterAcrossDataCenters(dcIds, nodesPerDc); + + verifyDistributionProperties(srv, dcIds, nodesPerDc, backups); + + //stopping one node in DC_1 should not compromise distribution as there are additional nodes in the same DC + stopGrid(5); + + awaitPartitionMapExchange(); + + verifyDistributionProperties(srv, dcIds, nodesPerDc, backups); + + //stopping another node in DC_1 should not compromise distribution as well + stopGrid(6); + + awaitPartitionMapExchange(); + + verifyDistributionProperties(srv, dcIds, nodesPerDc, backups); + } + + /** + * Verifies that partition copies are assigned evenly across a cluster in three data centers. + * + * @throws Exception If failed. + */ + @Test + public void test3DcDistribution() throws Exception { + dcIds = new String[] {"DC_0", "DC_1", "DC_2"}; + int nodesPerDc = 2; + backups = 5; + + IgniteEx srv = startClusterAcrossDataCenters(dcIds, 2); + + verifyDistributionProperties(srv, dcIds, nodesPerDc, backups); + } + + /** */ + private void verifyGridFailsToStartWithMessage(String msg) { + try { + startGrid(0); + } catch (IllegalArgumentException argEx) { Review Comment: `assertThrowsWithCause/assertThrows` can be used. -- This is an automated message from the Apache Git Service. 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