Add basic IT

Author: linuxpi

server/src/internalClusterTest/java/org/opensearch/index/ClusterMaxMergesAtOnceIT.java

@@ -0,0 +1,97 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ */
+
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch 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.
+ */
+
+/*
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+package org.opensearch.index;
+
+import org.opensearch.action.admin.indices.get.GetIndexRequest;
+import org.opensearch.action.admin.indices.get.GetIndexResponse;
+import org.opensearch.cluster.metadata.IndexMetadata;
+import org.opensearch.common.settings.Settings;
+import org.opensearch.core.index.Index;
+import org.opensearch.indices.IndicesService;
+import org.opensearch.snapshots.AbstractSnapshotIntegTestCase;
+import org.opensearch.test.OpenSearchIntegTestCase;
+import org.junit.Before;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.ExecutionException;
+
+import static org.opensearch.indices.IndicesService.CLUSTER_DEFAULT_INDEX_MAX_MERGE_AT_ONCE_SETTING;
+
+@OpenSearchIntegTestCase.ClusterScope(scope = OpenSearchIntegTestCase.Scope.TEST, numDataNodes = 2)
+public class ClusterMaxMergesAtOnceIT extends AbstractSnapshotIntegTestCase {
+
+    @Override
+    public Settings indexSettings() {
+        return Settings.builder().put(super.indexSettings()).put(IndexMetadata.SETTING_NUMBER_OF_REPLICAS, 1).build();
+    }
+
+    @Override
+    @Before
+    public void setUp() throws Exception {
+        super.setUp();
+        internalCluster().startClusterManagerOnlyNode();
+    }
+
+    public void testClusterLevelDefaultUpdatesMergePolicy() throws ExecutionException, InterruptedException {
+        String clusterManagerName = internalCluster().getClusterManagerName();
+        List<String> dataNodes = new ArrayList<>(internalCluster().getDataNodeNames());
+
+        String indexName = "log-myindex-1";
+        createIndex(indexName);
+        ensureYellowAndNoInitializingShards(indexName);
+        ensureGreen(indexName);
+        GetIndexResponse getIndexResponse = client(clusterManagerName).admin().indices().getIndex(new GetIndexRequest()).get();
+        IndicesService indicesService = internalCluster().getInstance(IndicesService.class, randomFrom(dataNodes));
+        String uuid = getIndexResponse.getSettings().get(indexName).get(IndexMetadata.SETTING_INDEX_UUID);
+        IndexService indexService = indicesService.indexService(new Index(indexName, uuid));
+        assertEquals(30, ((OpenSearchTieredMergePolicy) indexService.getIndexSettings().getMergePolicy(true)).getMaxMergeAtOnce());
+
+        client(clusterManagerName).admin()
+            .cluster()
+            .prepareUpdateSettings()
+            .setTransientSettings(Settings.builder().put(CLUSTER_DEFAULT_INDEX_MAX_MERGE_AT_ONCE_SETTING.getKey(), 20))
+            .get();
+
+        indexName = "log-myindex-2";
+        createIndex(indexName);
+        ensureYellowAndNoInitializingShards(indexName);
+        ensureGreen(indexName);
+        getIndexResponse = client(clusterManagerName).admin().indices().getIndex(new GetIndexRequest()).get();
+        indicesService = internalCluster().getInstance(IndicesService.class, randomFrom(dataNodes));
+        uuid = getIndexResponse.getSettings().get(indexName).get(IndexMetadata.SETTING_INDEX_UUID);
+        IndexService newIndexService = indicesService.indexService(new Index(indexName, uuid));
+        assertEquals(20, ((OpenSearchTieredMergePolicy) indexService.getIndexSettings().getMergePolicy(true)).getMaxMergeAtOnce());
+        assertEquals(20, ((OpenSearchTieredMergePolicy) newIndexService.getIndexSettings().getMergePolicy(true)).getMaxMergeAtOnce());
+    }
+}