[GitHub] [hbase] sunhelly commented on a change in pull request #426: HBASE-22695 Store the rsgroup of a table in table configuration

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sunhelly commented on a change in pull request #426: HBASE-22695 Store the rsgroup of a table in table configuration
URL: https://github.com/apache/hbase/pull/426#discussion_r309967126
 
 

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 File path: hbase-server/src/main/java/org/apache/hadoop/hbase/rsgroup/RSGroupUtil.java
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+/**
+ * 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.rsgroup;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.Optional;
+import java.util.function.Predicate;
+import org.apache.hadoop.hbase.NamespaceDescriptor;
+import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.TableDescriptor;
+import org.apache.hadoop.hbase.master.ClusterSchema;
+import org.apache.hadoop.hbase.master.MasterServices;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Helper class for RSGroup implementation
+ */
+@InterfaceAudience.Private
+final class RSGroupUtil {
+
+  private static final Logger LOG = LoggerFactory.getLogger(RSGroupUtil.class);
+
+  private RSGroupUtil() {
+  }
+
+  @FunctionalInterface
+  private interface GetRSGroup {
+    RSGroupInfo get(String groupName) throws IOException;
+  }
+
+  private static Optional<RSGroupInfo> getRSGroupInfo(MasterServices master, GetRSGroup getter,
+      TableName tableName) throws IOException {
+    TableDescriptor td = master.getTableDescriptors().get(tableName);
+    if (td == null) {
+      return Optional.empty();
+    }
+    Optional<String> optGroupNameOfTable = td.getRegionServerGroup();
+    if (optGroupNameOfTable.isPresent()) {
+      RSGroupInfo group = getter.get(optGroupNameOfTable.get());
+      if (group != null) {
+        return Optional.of(group);
+      }
+    }
+    ClusterSchema clusterSchema = master.getClusterSchema();
+    if (clusterSchema == null) {
+      if (TableName.isMetaTableName(tableName)) {
+        LOG.info("Can not get the namespace rs group config for meta table, since the" +
+            " meta table is not online yet, will use default group to assign meta first");
+      } else {
+        LOG.warn("ClusterSchema is null, can only use default rsgroup, should not happen?");
+      }
+      return Optional.empty();
+    }
+    NamespaceDescriptor nd = clusterSchema.getNamespace(tableName.getNamespaceAsString());
+    String groupNameOfNs = nd.getConfigurationValue(RSGroupInfo.NAMESPACE_DESC_PROP_GROUP);
+    if (groupNameOfNs == null) {
+      return Optional.empty();
 
 Review comment:
   Why not return RSGroupInfo.DEFAULT_GROUP instead of empty?

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