HBASE-17478 Avoid reporting FS use when quotas are disabled

Also, gracefully produce responses when quotas are disabled.

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

@@ -59,6 +59,7 @@ import org.apache.hadoop.hbase.procedure.MasterProcedureManager;
 import org.apache.hadoop.hbase.procedure2.LockInfo;
 import org.apache.hadoop.hbase.procedure2.Procedure;
 import org.apache.hadoop.hbase.quotas.MasterQuotaManager;
+import org.apache.hadoop.hbase.quotas.QuotaUtil;
 import org.apache.hadoop.hbase.regionserver.RSRpcServices;
 import org.apache.hadoop.hbase.replication.ReplicationException;
 import org.apache.hadoop.hbase.replication.ReplicationPeerConfig;
@@ -1911,6 +1912,9 @@ public class MasterRpcServices extends RSRpcServices
       RegionSpaceUseReportRequest request) throws ServiceException {
     try {
       master.checkInitialized();
+      if (!QuotaUtil.isQuotaEnabled(master.getConfiguration())) {
+        return RegionSpaceUseReportResponse.newBuilder().build();
+      }
       MasterQuotaManager quotaManager = this.master.getMasterQuotaManager();
       for (RegionSpaceUse report : request.getSpaceUseList()) {
         quotaManager.addRegionSize(HRegionInfo.convert(report.getRegion()), report.getSize());

hbase-server/src/main/java/org/apache/hadoop/hbase/quotas/MasterQuotaManager.java

@@ -19,6 +19,7 @@
 package org.apache.hadoop.hbase.quotas;
 
 import java.io.IOException;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
@@ -58,6 +59,8 @@ import org.apache.hadoop.hbase.shaded.protobuf.generated.QuotaProtos.TimedQuota;
 @InterfaceStability.Evolving
 public class MasterQuotaManager implements RegionStateListener {
   private static final Log LOG = LogFactory.getLog(MasterQuotaManager.class);
+  private static final Map<HRegionInfo, Long> EMPTY_MAP = Collections.unmodifiableMap(
+      new HashMap<>());
 
   private final MasterServices masterServices;
   private NamedLock<String> namespaceLocks;
@@ -529,13 +532,19 @@ public class MasterQuotaManager implements RegionStateListener {
   }
 
   public void addRegionSize(HRegionInfo hri, long size) {
-    // TODO Make proper API
+    if (null == regionSizes) {
+      return;
+    }
+    // TODO Make proper API?
     // TODO Prevent from growing indefinitely
     regionSizes.put(hri, size);
   }
 
   public Map<HRegionInfo, Long> snapshotRegionSizes() {
-    // TODO Make proper API
+    if (null == regionSizes) {
+      return EMPTY_MAP;
+    }
+    // TODO Make proper API?
     return new HashMap<>(regionSizes);
   }
 }

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java

@@ -119,6 +119,7 @@ import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer;
 import org.apache.hadoop.hbase.mob.MobCacheConfig;
 import org.apache.hadoop.hbase.procedure.RegionServerProcedureManagerHost;
 import org.apache.hadoop.hbase.quotas.FileSystemUtilizationChore;
+import org.apache.hadoop.hbase.quotas.QuotaUtil;
 import org.apache.hadoop.hbase.quotas.RegionServerRpcQuotaManager;
 import org.apache.hadoop.hbase.quotas.RegionServerSpaceQuotaManager;
 import org.apache.hadoop.hbase.regionserver.compactions.CompactionConfiguration;
@@ -933,7 +934,9 @@ public class HRegionServer extends HasThread implements
     rsQuotaManager = new RegionServerRpcQuotaManager(this);
     rsSpaceQuotaManager = new RegionServerSpaceQuotaManager(this);
 
+    if (QuotaUtil.isQuotaEnabled(conf)) {
       this.fsUtilizationChore = new FileSystemUtilizationChore(this);
+    }
 
     // Setup RPC client for master communication
     rpcClient = RpcClientFactory.createClient(conf, clusterId, new InetSocketAddress(

hbase-server/src/test/java/org/apache/hadoop/hbase/quotas/TestMasterQuotaManager.java

@@ -0,0 +1,37 @@
+/*
+ * 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.quotas;
+
+import static org.junit.Assert.assertNotNull;
+import static org.mockito.Mockito.mock;
+
+import org.apache.hadoop.hbase.master.MasterServices;
+import org.apache.hadoop.hbase.testclassification.SmallTests;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+
+@Category(SmallTests.class)
+public class TestMasterQuotaManager {
+
+  @Test
+  public void testUninitializedQuotaManangerDoesNotFail() {
+    MasterServices masterServices = mock(MasterServices.class);
+    MasterQuotaManager manager = new MasterQuotaManager(masterServices);
+    manager.addRegionSize(null, 0);
+    assertNotNull(manager.snapshotRegionSizes());
+  }
+}