HADOOP-15474. Rename properties introduced for <tags>. Contributed by Zsolt Venczel.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java

@@ -198,8 +198,8 @@ import static org.apache.commons.lang3.StringUtils.isNotBlank;
  * <h4 id="Tags">Tags</h4>
  *
  * <p>Optionally we can tag related properties together by using tag
- * attributes. System tags are defined by hadoop.system.tags property. Users
- * can define there own custom tags in  hadoop.custom.tags property.
+ * attributes. System tags are defined by hadoop.tags.system property. Users
+ * can define there own custom tags in  hadoop.tags.custom property.
  *
  * <p>For example, we can tag existing property as:
  * <tt><pre>
@@ -3180,12 +3180,24 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
   }
 
   /**
-   * Add tags defined in HADOOP_SYSTEM_TAGS, HADOOP_CUSTOM_TAGS.
+   * Add tags defined in HADOOP_TAGS_SYSTEM, HADOOP_TAGS_CUSTOM.
    * @param prop
    */
   public void addTags(Properties prop) {
     // Get all system tags
     try {
+      if (prop.containsKey(CommonConfigurationKeys.HADOOP_TAGS_SYSTEM)) {
+        String systemTags = prop.getProperty(CommonConfigurationKeys
+            .HADOOP_TAGS_SYSTEM);
+        Arrays.stream(systemTags.split(",")).forEach(tag -> TAGS.add(tag));
+      }
+      // Get all custom tags
+      if (prop.containsKey(CommonConfigurationKeys.HADOOP_TAGS_CUSTOM)) {
+        String customTags = prop.getProperty(CommonConfigurationKeys
+            .HADOOP_TAGS_CUSTOM);
+        Arrays.stream(customTags.split(",")).forEach(tag -> TAGS.add(tag));
+      }
+
       if (prop.containsKey(CommonConfigurationKeys.HADOOP_SYSTEM_TAGS)) {
         String systemTags = prop.getProperty(CommonConfigurationKeys
             .HADOOP_SYSTEM_TAGS);

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/CommonConfigurationKeysPublic.java

@@ -881,7 +881,22 @@ public class CommonConfigurationKeysPublic {
           "credential$",
           "oauth.*token$",
           HADOOP_SECURITY_SENSITIVE_CONFIG_KEYS);
+
+  /**
+   * @deprecated Please use
+   * {@link CommonConfigurationKeysPublic#HADOOP_TAGS_SYSTEM} instead
+   * See https://issues.apache.org/jira/browse/HADOOP-15474
+   */
   public static final String HADOOP_SYSTEM_TAGS = "hadoop.system.tags";
+
+  /**
+   * @deprecated Please use
+   * {@link CommonConfigurationKeysPublic#HADOOP_TAGS_CUSTOM} instead
+   * See https://issues.apache.org/jira/browse/HADOOP-15474
+   */
   public static final String HADOOP_CUSTOM_TAGS = "hadoop.custom.tags";
+
+  public static final String HADOOP_TAGS_SYSTEM = "hadoop.tags.system";
+  public static final String HADOOP_TAGS_CUSTOM = "hadoop.tags.custom";
 }
 

hadoop-common-project/hadoop-common/src/main/resources/core-default.xml

@@ -3035,7 +3035,16 @@
   <property>
     <name>hadoop.system.tags</name>
     <value>YARN,HDFS,NAMENODE,DATANODE,REQUIRED,SECURITY,KERBEROS,PERFORMANCE,CLIENT
-      ,SERVER,DEBUG,DEPRICATED,COMMON,OPTIONAL</value>
+      ,SERVER,DEBUG,DEPRECATED,COMMON,OPTIONAL</value>
+    <description>
+      Deprecated. Please use hadoop.tags.system instead.
+    </description>
+  </property>
+
+  <property>
+    <name>hadoop.tags.system</name>
+    <value>YARN,HDFS,NAMENODE,DATANODE,REQUIRED,SECURITY,KERBEROS,PERFORMANCE,CLIENT
+      ,SERVER,DEBUG,DEPRECATED,COMMON,OPTIONAL</value>
     <description>
       System tags to group related properties together.
     </description>

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfiguration.java

@@ -2361,8 +2361,8 @@ public class TestConfiguration {
     try{
       out = new BufferedWriter(new FileWriter(CONFIG_CORE));
       startConfig();
-      appendProperty("hadoop.system.tags", "YARN,HDFS,NAMENODE");
-      appendProperty("hadoop.custom.tags", "MYCUSTOMTAG");
+      appendProperty("hadoop.tags.system", "YARN,HDFS,NAMENODE");
+      appendProperty("hadoop.tags.custom", "MYCUSTOMTAG");
       appendPropertyByTag("dfs.cblock.trace.io", "false", "YARN");
       appendPropertyByTag("dfs.replication", "1", "HDFS");
       appendPropertyByTag("dfs.namenode.logging.level", "INFO", "NAMENODE");