[GitHub] [ozone] rakeshadr commented on a change in pull request #2571: [FSO] Allow existing/old buckets with any layout during OM startup

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rakeshadr commented on a change in pull request #2571:
URL: https://github.com/apache/ozone/pull/2571#discussion_r754792910



##########
File path: hadoop-ozone/integration-test/src/test/java/org/apache/hadoop/ozone/om/TestOMStartupWithBucketLayout.java
##########
@@ -0,0 +1,151 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.hadoop.ozone.om;
+
+import org.apache.hadoop.hdds.conf.OzoneConfiguration;
+import org.apache.hadoop.ozone.MiniOzoneCluster;
+import org.apache.hadoop.ozone.TestDataUtil;
+import org.apache.hadoop.ozone.client.OzoneBucket;
+import org.apache.hadoop.ozone.om.helpers.BucketLayout;
+import org.junit.Assert;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.Timeout;
+
+import java.util.UUID;
+
+/**
+ * Verifies OM startup with different layout.
+ */
+public class TestOMStartupWithBucketLayout {
+
+  /**
+   * Set a timeout for each test.
+   */
+  @Rule
+  public Timeout timeout = Timeout.seconds(300);
+
+  private static MiniOzoneCluster cluster;
+
+  public static void startClusterWithSimpleLayout() throws Exception {
+    OzoneConfiguration conf = new OzoneConfiguration();
+    String clusterId = UUID.randomUUID().toString();
+    String scmId = UUID.randomUUID().toString();
+    String omId = UUID.randomUUID().toString();
+    conf.set(OMConfigKeys.OZONE_DEFAULT_BUCKET_LAYOUT,
+        BucketLayout.OBJECT_STORE.name());
+    cluster = MiniOzoneCluster.newBuilder(conf).setClusterId(clusterId)

Review comment:
       @zhengchenyu Can you make zero dns as this test requires only OMs, right
   
   `cluster = MiniOzoneCluster.newBuilder(conf).withoutDatanodes().build();`




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