HADOOP-10625. Trim configuration names when putting/getting them to properties

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1598072 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -334,6 +334,9 @@ Trunk (Unreleased)
 
     HADOOP-10586. KeyShell doesn't allow setting Options via CLI. (clamb via tucu)
 
+    HADOOP-10625. Trim configuration names when putting/getting them
+    to properties. (Wangda Tan via xgong)
+
   OPTIMIZATIONS
 
     HADOOP-7761. Improve the performance of raw comparisons. (todd)

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

@@ -566,6 +566,9 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
    */
   private String[] handleDeprecation(DeprecationContext deprecations,
       String name) {
+    if (null != name) {
+      name = name.trim();
+    }
     ArrayList<String > names = new ArrayList<String>();
 	if (isDeprecated(name)) {
       DeprecatedKeyInfo keyInfo = deprecations.getDeprecatedKeyMap().get(name);
@@ -843,12 +846,12 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
   /**
    * Get the value of the <code>name</code> property, <code>null</code> if
    * no such property exists. If the key is deprecated, it returns the value of
-   * the first key which replaces the deprecated key and is not null
+   * the first key which replaces the deprecated key and is not null.
    * 
    * Values are processed for <a href="#VariableExpansion">variable expansion</a> 
    * before being returned. 
    * 
-   * @param name the property name.
+   * @param name the property name, will be trimmed before get value.
    * @return the value of the <code>name</code> or its replacing property, 
    *         or null if no such property exists.
    */
@@ -952,7 +955,8 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
   /** 
    * Set the <code>value</code> of the <code>name</code> property. If 
    * <code>name</code> is deprecated or there is a deprecated name associated to it,
-   * it sets the value to both names.
+   * it sets the value to both names. Name will be trimmed before put into
+   * configuration.
    * 
    * @param name property name.
    * @param value property value.
@@ -964,7 +968,8 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
   /** 
    * Set the <code>value</code> of the <code>name</code> property. If 
    * <code>name</code> is deprecated, it also sets the <code>value</code> to
-   * the keys that replace the deprecated key.
+   * the keys that replace the deprecated key. Name will be trimmed before put
+   * into configuration.
    *
    * @param name property name.
    * @param value property value.
@@ -979,6 +984,7 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
     Preconditions.checkArgument(
         value != null,
         "The value of property " + name + " must not be null");
+    name = name.trim();
     DeprecationContext deprecations = deprecationContext.get();
     if (deprecations.getDeprecatedKeyMap().isEmpty()) {
       getProps();
@@ -1064,7 +1070,7 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
    * If no such property exists,
    * then <code>defaultValue</code> is returned.
    * 
-   * @param name property name.
+   * @param name property name, will be trimmed before get value.
    * @param defaultValue default value.
    * @return property value, or <code>defaultValue</code> if the property 
    *         doesn't exist.                    

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

@@ -1003,6 +1003,14 @@ public class TestConfiguration extends TestCase {
     String resource;
   }
   
+  public void testGetSetTrimmedNames() throws IOException {
+    Configuration conf = new Configuration(false);
+    conf.set(" name", "value");
+    assertEquals("value", conf.get("name"));
+    assertEquals("value", conf.get(" name"));
+    assertEquals("value", conf.getRaw("  name  "));
+  }
+
   public void testDumpConfiguration () throws IOException {
     StringWriter outWriter = new StringWriter();
     Configuration.dumpConfiguration(conf, outWriter);