Add missing file from HDFS-5141

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-4949@1519819 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/protocol/CacheReport.java

@@ -0,0 +1,44 @@
+/**
+ * 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.hdfs.server.protocol;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+
+/**
+ * Utilization report for a Datanode cache
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
+public class CacheReport {
+  private final long capacity;
+  private final long used;
+  
+  public CacheReport(long capacity, long used) {
+    this.capacity = capacity;
+    this.used = used;
+  }
+
+  public long getCapacity() {
+    return capacity;
+  }
+
+  public long getUsed() {
+    return used;
+  }
+}