IGNITE-24580 Implement happy-case and preform of a test

Author: sergey-chugunov-1985

modules/core/src/main/java/org/apache/ignite/cache/affinity/rendezvous/DcAffinityBackupFilter.java

@@ -40,22 +40,28 @@ public class DcAffinityBackupFilter implements IgniteBiPredicate<ClusterNode, Li
 
     /**
      * @param dcsCount
-     * @param primaryAndBackups
+     * @param backups
      */
-    public DcAffinityBackupFilter(int dcsCount, int primaryAndBackups) {
+    public DcAffinityBackupFilter(int dcsCount, int backups) {
         this.dcsCount = dcsCount;
         partsDistrMap = new LinkedHashMap<>(4);
-        this.primaryAndBackups = primaryAndBackups;
+        primaryAndBackups = backups + 1;
     }
 
     /** {@inheritDoc} */
     @Override public boolean apply(ClusterNode node, List<ClusterNode> list) {
+        if (list.size() == 1)
+            partsDistrMap.put(list.get(0).dataCenterId(), 1); //account for primary node which is assigned beforehand
+
         String candidateDcId = node.dataCenterId();
         Integer candDcPartsCopies = partsDistrMap.get(candidateDcId);
         boolean res = false;
 
-        if (candDcPartsCopies == null || candDcPartsCopies == -1)
+        if (candDcPartsCopies == null || candDcPartsCopies == -1) {
             partsDistrMap.put(candidateDcId, 1);
+
+            res = true;
+        }
         else {
             int partCopiesPerDc = primaryAndBackups / dcsCount;
 
@@ -68,11 +74,9 @@ public DcAffinityBackupFilter(int dcsCount, int primaryAndBackups) {
 
         Optional<Integer> sum = partsDistrMap.values().stream().reduce(Integer::sum);
 
-        if (sum.isPresent() || sum.get() == primaryAndBackups)
+        if (sum.isPresent() && sum.get() == primaryAndBackups)
             partsDistrMap.replaceAll((e, v) -> -1);
 
         return res;
     }
-
-//    private int nextBucketVolume(int primaryAndBackups, int dcsCount, int ) {
 }

modules/core/src/test/java/org/apache/ignite/cache/affinity/rendezvous/DcAffinityBackupFilterSelfTest.java

@@ -0,0 +1,57 @@
+/*
+ * 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 org.apache.ignite.IgniteCheckedException;
+import org.apache.ignite.IgniteSystemProperties;
+import org.apache.ignite.configuration.CacheConfiguration;
+import org.apache.ignite.configuration.IgniteConfiguration;
+import org.apache.ignite.internal.IgniteEx;
+import org.apache.ignite.testframework.junits.common.GridCommonAbstractTest;
+import org.junit.Test;
+
+/** */
+public class DcAffinityBackupFilterSelfTest extends GridCommonAbstractTest {
+    /** */
+    private static final String DC_0_ID = "DC_0";
+
+    /** */
+    private static final String DC_1_ID = "DC_1";
+
+    @Override protected IgniteConfiguration optimize(IgniteConfiguration cfg) throws IgniteCheckedException {
+        return super.optimize(cfg).setIncludeProperties((String[])null);
+    }
+
+    @Test
+    public void test1() throws Exception {
+        System.setProperty(IgniteSystemProperties.IGNITE_DATA_CENTER_ID, DC_0_ID);
+        startGrids(3);
+
+        System.setProperty(IgniteSystemProperties.IGNITE_DATA_CENTER_ID, DC_1_ID);
+        startGrid(3);
+        startGrid(4);
+        IgniteEx srv = startGrid(5);
+
+        CacheConfiguration ccfg = defaultCacheConfiguration();
+        ccfg.setBackups(3);
+        ccfg.setAffinity(new RendezvousAffinityFunction(false, 2)
+            .setAffinityBackupFilter(new DcAffinityBackupFilter(2, 3)));
+
+        srv.getOrCreateCache(ccfg);
+    }
+}