HBASE-28239 Auto create configured namespaces

hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/InitMetaProcedure.java

@@ -28,6 +28,7 @@
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hbase.NamespaceDescriptor;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.RegionInfoBuilder;
 import org.apache.hadoop.hbase.client.TableDescriptor;
@@ -57,6 +58,8 @@ public class InitMetaProcedure extends AbstractStateMachineTableProcedure<InitMe
 
   private static final Logger LOG = LoggerFactory.getLogger(InitMetaProcedure.class);
 
+  public static final String ADDITIONAL_NAMESPACES = "hbase.master.additional.namespaces";
+
   private CountDownLatch latch = new CountDownLatch(1);
 
   private RetryCounter retryCounter;
@@ -119,6 +122,19 @@ protected Flow executeFromState(MasterProcedureEnv env, InitMetaState state)
           // namespaces when starting.
           insertNamespaceToMeta(env.getMasterServices().getConnection(), DEFAULT_NAMESPACE);
           insertNamespaceToMeta(env.getMasterServices().getConnection(), SYSTEM_NAMESPACE);
+          // create the additional namespaces based on the configuration value
+          String[] customNamespaces =
+            env.getMasterConfiguration().getStrings(ADDITIONAL_NAMESPACES);
+          if (null != customNamespaces && customNamespaces.length > 0) {
+            Arrays.stream(customNamespaces).forEach(ns -> {
+              try {
+                insertNamespaceToMeta(env.getMasterServices().getConnection(),
+                  NamespaceDescriptor.create(ns).build());
+              } catch (IOException e) {
+                throw new RuntimeException(e);
+              }
+            });
+          }
 
           return Flow.NO_MORE_STATE;
         default:

hbase-server/src/test/java/org/apache/hadoop/hbase/TestAdditionalNameSpaceCreation.java

@@ -0,0 +1,81 @@
+/*
+ * 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.hadoop.hbase;
+
+import static org.apache.hadoop.hbase.master.procedure.InitMetaProcedure.ADDITIONAL_NAMESPACES;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+import org.apache.hadoop.hbase.client.Admin;
+import org.apache.hadoop.hbase.master.HMaster;
+import org.apache.hadoop.hbase.testclassification.MediumTests;
+import org.apache.hadoop.hbase.testclassification.MiscTests;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.ClassRule;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+import org.junit.rules.TestName;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+@Category({ MiscTests.class, MediumTests.class })
+public class TestAdditionalNameSpaceCreation {
+
+  @ClassRule
+  public static final HBaseClassTestRule CLASS_RULE =
+    HBaseClassTestRule.forClass(TestAdditionalNameSpaceCreation.class);
+
+  private static final Logger LOG = LoggerFactory.getLogger(TestAdditionalNameSpaceCreation.class);
+  private static HMaster master;
+  protected final static int NUM_SLAVES_BASE = 4;
+  private static HBaseTestingUtil TEST_UTIL;
+  protected static Admin admin;
+  protected static HBaseClusterInterface cluster;
+
+  @Rule
+  public TestName name = new TestName();
+
+  @BeforeClass
+  public static void setUp() throws Exception {
+    TEST_UTIL = new HBaseTestingUtil();
+    TEST_UTIL.getConfiguration().setStrings(ADDITIONAL_NAMESPACES, "ns1", "ns2");
+    TEST_UTIL.startMiniCluster(NUM_SLAVES_BASE);
+    admin = TEST_UTIL.getAdmin();
+    cluster = TEST_UTIL.getHBaseCluster();
+    master = ((SingleProcessHBaseCluster) cluster).getMaster();
+    LOG.info("Done initializing cluster");
+  }
+
+  @AfterClass
+  public static void tearDown() throws Exception {
+    TEST_UTIL.shutdownMiniCluster();
+  }
+
+  @Test
+  public void testCustomNameSpaceCreationDuringStartup() throws IOException {
+    List<String> namespaces = Arrays.asList(admin.listNamespaces());
+    assertEquals(4, namespaces.size());
+    assertTrue(namespaces.contains("ns1"));
+    assertTrue(namespaces.contains("ns2"));
+  }
+}