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From sur...@apache.org
Subject svn commit: r1402639 - in /hadoop/common/branches/branch-1/src/core/org/apache/hadoop: conf/Configuration.java http/HttpServer.java
Date Fri, 26 Oct 2012 19:56:39 GMT
Author: suresh
Date: Fri Oct 26 19:56:39 2012
New Revision: 1402639

URL: http://svn.apache.org/viewvc?rev=1402639&view=rev
Log:
HADOOP-8567. Port conf servlet to dump running configuration  to branch 1.x. Contributed by
Jing Zhao.

Modified:
    hadoop/common/branches/branch-1/src/core/org/apache/hadoop/conf/Configuration.java
    hadoop/common/branches/branch-1/src/core/org/apache/hadoop/http/HttpServer.java

Modified: hadoop/common/branches/branch-1/src/core/org/apache/hadoop/conf/Configuration.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-1/src/core/org/apache/hadoop/conf/Configuration.java?rev=1402639&r1=1402638&r2=1402639&view=diff
==============================================================================
--- hadoop/common/branches/branch-1/src/core/org/apache/hadoop/conf/Configuration.java (original)
+++ hadoop/common/branches/branch-1/src/core/org/apache/hadoop/conf/Configuration.java Fri
Oct 26 19:56:39 2012
@@ -27,6 +27,7 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
+import java.io.OutputStreamWriter;
 import java.io.Reader;
 import java.io.Writer;
 import java.net.URL;
@@ -51,6 +52,7 @@ import javax.xml.parsers.DocumentBuilder
 import javax.xml.parsers.DocumentBuilderFactory;
 import javax.xml.parsers.ParserConfigurationException;
 import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
 import javax.xml.transform.TransformerFactory;
 import javax.xml.transform.dom.DOMSource;
 import javax.xml.transform.stream.StreamResult;
@@ -65,6 +67,7 @@ import org.apache.hadoop.util.Reflection
 import org.apache.hadoop.util.StringUtils;
 import org.codehaus.jackson.JsonFactory;
 import org.codehaus.jackson.JsonGenerator;
+import org.w3c.dom.Comment;
 import org.w3c.dom.DOMException;
 import org.w3c.dom.Document;
 import org.w3c.dom.Element;
@@ -171,10 +174,10 @@ public class Configuration implements It
     new CopyOnWriteArrayList<String>();
   
   /**
-   * Flag to indicate if the storage of resource which updates a key needs 
-   * to be stored for each key
+   * The value reported as the setting resource when a key is set
+   * by code rather than a file resource.
    */
-  private boolean storeResource;
+  static final String UNKNOWN_RESOURCE = "Unknown";
   
   /**
    * Stores the mapping of key to the resource which modifies or loads 
@@ -223,30 +226,13 @@ public class Configuration implements It
    */
   public Configuration(boolean loadDefaults) {
     this.loadDefaults = loadDefaults;
+    updatingResource = new HashMap<String, String>();
     if (LOG.isDebugEnabled()) {
       LOG.debug(StringUtils.stringifyException(new IOException("config()")));
     }
     synchronized(Configuration.class) {
       REGISTRY.put(this, null);
     }
-    this.storeResource = false;
-  }
-  
-  /**
-   * A new configuration with the same settings and additional facility for
-   * storage of resource to each key which loads or updates 
-   * the key most recently
-   * @param other the configuration from which to clone settings
-   * @param storeResource flag to indicate if the storage of resource to 
-   * each key is to be stored
-   */
-  private Configuration(Configuration other, boolean storeResource) {
-    this(other);
-    this.loadDefaults = other.loadDefaults;
-    this.storeResource = storeResource;
-    if (storeResource) {
-      updatingResource = new HashMap<String, String>();
-    }
   }
   
   /** 
@@ -260,20 +246,23 @@ public class Configuration implements It
       LOG.debug(StringUtils.stringifyException
                 (new IOException("config(config)")));
     }
-   
-   this.resources = (ArrayList)other.resources.clone();
-   synchronized(other) {
-     if (other.properties != null) {
-       this.properties = (Properties)other.properties.clone();
-     }
-
-     if (other.overlay!=null) {
-       this.overlay = (Properties)other.overlay.clone();
-     }
-   }
-   
+
+    this.resources = (ArrayList) other.resources.clone();
+    synchronized (other) {
+      if (other.properties != null) {
+        this.properties = (Properties) other.properties.clone();
+      }
+
+      if (other.overlay != null) {
+        this.overlay = (Properties) other.overlay.clone();
+      }
+
+      this.updatingResource = new HashMap<String, String>(
+          other.updatingResource);
+    }
+
     this.finalParameters = new HashSet<String>(other.finalParameters);
-    synchronized(Configuration.class) {
+    synchronized (Configuration.class) {
       REGISTRY.put(this, null);
     }
   }
@@ -437,6 +426,7 @@ public class Configuration implements It
   public void set(String name, String value) {
     getOverlay().setProperty(name, value);
     getProps().setProperty(name, value);
+    this.updatingResource.put(name, UNKNOWN_RESOURCE);
   }
  
   /**
@@ -1071,10 +1061,8 @@ public class Configuration implements It
       loadResources(properties, resources, quietmode);
       if (overlay!= null) {
         properties.putAll(overlay);
-        if (storeResource) {
-          for (Map.Entry<Object,Object> item: overlay.entrySet()) {
-            updatingResource.put((String) item.getKey(), "Unknown");
-          }
+        for (Map.Entry<Object,Object> item: overlay.entrySet()) {
+          updatingResource.put((String) item.getKey(), UNKNOWN_RESOURCE);
         }
       }
     }
@@ -1246,9 +1234,7 @@ public class Configuration implements It
           if (value != null) {
             if (!finalParameters.contains(attr)) {
               properties.setProperty(attr, value);
-              if (storeResource) {
-                updatingResource.put(attr, name.toString());
-              }
+              updatingResource.put(attr, name.toString());
             } else if (!value.equals(properties.getProperty(attr))) {
               LOG.warn(name+":a attempt to override final parameter: "+attr
                      +";  Ignoring.");
@@ -1276,12 +1262,22 @@ public class Configuration implements It
   }
 
   /** 
-   * Write out the non-default properties in this configuration to the give
+   * Write out the non-default properties in this configuration to the given
    * {@link OutputStream}.
    * 
    * @param out the output stream to write to.
    */
   public void writeXml(OutputStream out) throws IOException {
+    writeXml(new OutputStreamWriter(out));
+  }
+  
+  /**
+   * Write out the non-default properties in this configuration to the given
+   * {@link Writer}.
+   * 
+   * @param out the writer to write to.
+   */
+  public synchronized void writeXml(Writer out) throws IOException {
     Properties properties = getProps();
     try {
       Document doc =
@@ -1300,7 +1296,11 @@ public class Configuration implements It
         }
         Element propNode = doc.createElement("property");
         conf.appendChild(propNode);
-      
+        if (updatingResource != null) {
+          Comment commentNode = doc.createComment("Loaded from "
+              + updatingResource.get(name));
+          propNode.appendChild(commentNode);
+        }
         Element nameNode = doc.createElement("name");
         nameNode.appendChild(doc.createTextNode(name));
         propNode.appendChild(nameNode);
@@ -1317,8 +1317,10 @@ public class Configuration implements It
       TransformerFactory transFactory = TransformerFactory.newInstance();
       Transformer transformer = transFactory.newTransformer();
       transformer.transform(source, result);
-    } catch (Exception e) {
-      throw new RuntimeException(e);
+    } catch (TransformerException te) {
+      throw new IOException(te);
+    } catch (ParserConfigurationException pe) {
+      throw new IOException(pe);
     }
   }
 
@@ -1333,26 +1335,26 @@ public class Configuration implements It
    * @param out the Writer to write to
    * @throws IOException
    */
-  public static void dumpConfiguration(Configuration conf, 
+  public static void dumpConfiguration(Configuration config, 
       Writer out) throws IOException {
-    Configuration config = new Configuration(conf,true);
-    config.reloadConfiguration();
     JsonFactory dumpFactory = new JsonFactory();
     JsonGenerator dumpGenerator = dumpFactory.createJsonGenerator(out);
     dumpGenerator.writeStartObject();
     dumpGenerator.writeFieldName("properties");
     dumpGenerator.writeStartArray();
     dumpGenerator.flush();
-    for (Map.Entry<Object,Object> item: config.getProps().entrySet()) {
-      dumpGenerator.writeStartObject();
-      dumpGenerator.writeStringField("key", (String) item.getKey());
-      dumpGenerator.writeStringField("value", 
-          config.get((String) item.getKey()));
-      dumpGenerator.writeBooleanField("isFinal",
-          config.finalParameters.contains(item.getKey()));
-      dumpGenerator.writeStringField("resource",
-          config.updatingResource.get(item.getKey()));
-      dumpGenerator.writeEndObject();
+    synchronized (config) {
+      for (Map.Entry<Object,Object> item: config.getProps().entrySet()) {
+        dumpGenerator.writeStartObject();
+        dumpGenerator.writeStringField("key", (String) item.getKey());
+        dumpGenerator.writeStringField("value", 
+            config.get((String) item.getKey()));
+        dumpGenerator.writeBooleanField("isFinal",
+            config.finalParameters.contains(item.getKey()));
+        dumpGenerator.writeStringField("resource",
+            config.updatingResource.get(item.getKey()));
+        dumpGenerator.writeEndObject();
+      }
     }
     dumpGenerator.writeEndArray();
     dumpGenerator.writeEndObject();

Modified: hadoop/common/branches/branch-1/src/core/org/apache/hadoop/http/HttpServer.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/branch-1/src/core/org/apache/hadoop/http/HttpServer.java?rev=1402639&r1=1402638&r2=1402639&view=diff
==============================================================================
--- hadoop/common/branches/branch-1/src/core/org/apache/hadoop/http/HttpServer.java (original)
+++ hadoop/common/branches/branch-1/src/core/org/apache/hadoop/http/HttpServer.java Fri Oct
26 19:56:39 2012
@@ -85,10 +85,10 @@ public class HttpServer implements Filte
 
   static final String FILTER_INITIALIZER_PROPERTY
       = "hadoop.http.filter.initializers";
-
+ 
   // The ServletContext attribute where the daemon Configuration
   // gets stored.
-  static final String CONF_CONTEXT_ATTRIBUTE = "hadoop.conf";
+  public static final String CONF_CONTEXT_ATTRIBUTE = "hadoop.conf";
   static final String ADMINS_ACL = "admins.acl";
   public static final String SPNEGO_FILTER = "SpnegoFilter";
   public static final String KRB5_FILTER = "krb5Filter";



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