anton-vinogradov commented on code in PR #12459: URL: https://github.com/apache/ignite/pull/12459#discussion_r2477886789
########## modules/core/src/test/java/org/apache/ignite/cache/affinity/rendezvous/MdcAffinityBackupFilterSelfTest.java: ########## @@ -0,0 +1,289 @@ +/* + * 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.IgniteCheckedException; +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.lang.IgniteBiPredicate; +import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest; +import org.junit.Test; + +import static org.apache.ignite.testframework.GridTestUtils.assertThrows; + +/** + * 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 = 1024; + + /** */ + private int backups; + + /** */ + private String[] dcIds; + + /** */ + private IgniteBiPredicate<ClusterNode, List<ClusterNode>> filter; + + /** {@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(filter))); + + 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() { + assertThrows(null, + () -> new MdcAffinityBackupFilter(1, 1), + IllegalArgumentException.class, + "Number of datacenters must be at least 2."); Review Comment: It's ok to have a single DC, at least for the case "we're planning to separate the cluster". And for the case "Second DC is currently down". -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
