HDFS-5585. Provide admin commands for data node upgrade. Contributed by Kihwal Lee. (missing file)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/HDFS-5535@1568524 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -0,0 +1,64 @@
+/**
+ * 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.protocol;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+
+
+/**
+ * Locally available datanode information
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Evolving
+public class DatanodeLocalInfo {
+  private String softwareVersion;
+  private String configVersion;
+  private long uptime; // datanode uptime in seconds.
+
+  public DatanodeLocalInfo(String softwareVersion,
+      String configVersion, long uptime) {
+    this.softwareVersion = softwareVersion;
+    this.configVersion = configVersion;
+    this.uptime = uptime;
+  }
+
+  /** get software version */
+  public String getSoftwareVersion() {
+    return this.softwareVersion;
+  }
+
+  /** get config version */
+  public String getConfigVersion() {
+    return this.configVersion;
+  }
+
+  /** get uptime */
+  public long getUptime() {
+    return this.uptime;
+  }
+
+  /** A formatted string for printing the status of the DataNode. */
+  public String getDatanodeLocalReport() {
+    StringBuilder buffer = new StringBuilder();
+    buffer.append("Uptime: " + getUptime());
+    buffer.append(", Software version: " + getSoftwareVersion());
+    buffer.append(", Config version: " + getConfigVersion());
+    return buffer.toString();
+  }
+}