Merge -r 1335084:1335085 from trunk to branch-2. Fixes: HADOOP-8328

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1335087 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -294,6 +294,9 @@ Release 2.0.0 - UNRELEASED
 
     HADOOP-8349. ViewFS doesn't work when the root of a file system is mounted. (atm)
 
+    HADOOP-8328. Duplicate FileSystem Statistics object for 'file' scheme.
+    (tomwhite)
+
   BREAKDOWN OF HADOOP-7454 SUBTASKS
 
     HADOOP-7455. HA: Introduce HA Service Protocol Interface. (suresh)

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

@@ -53,7 +53,7 @@ import org.apache.hadoop.util.Progressable;
 public class FilterFileSystem extends FileSystem {
   
   protected FileSystem fs;
-  private String swapScheme;
+  protected String swapScheme;
   
   /*
    * so that extending classes can define it

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

@@ -39,6 +39,17 @@ public class LocalFileSystem extends ChecksumFileSystem {
   public LocalFileSystem() {
     this(new RawLocalFileSystem());
   }
+  
+  @Override
+  public void initialize(URI name, Configuration conf) throws IOException {
+    if (fs.getConf() == null) {
+      fs.initialize(name, conf);
+    }
+    String scheme = name.getScheme();
+    if (!scheme.equals(fs.getUri().getScheme())) {
+      swapScheme = scheme;
+    }
+  }
 
   /**
    * Return the protocol scheme for the FileSystem.

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/fs/TestLocalFileSystem.java

@@ -18,11 +18,14 @@
 package org.apache.hadoop.fs;
 
 import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.fs.FileSystem.Statistics;
+
 import static org.apache.hadoop.fs.FileSystemTestHelper.*;
 
 import java.io.*;
 
 import static org.junit.Assert.*;
+
 import org.junit.Before;
 import org.junit.Test;
 
@@ -233,4 +236,16 @@ public class TestLocalFileSystem {
     assertTrue("Did not delete file", fs.delete(file1));
     assertTrue("Did not delete non-empty dir", fs.delete(dir1));
   }
+  
+  @Test
+  public void testStatistics() throws Exception {
+    FileSystem.getLocal(new Configuration());
+    int fileSchemeCount = 0;
+    for (Statistics stats : FileSystem.getAllStatistics()) {
+      if (stats.getScheme().equals("file")) {
+        fileSchemeCount++;
+      }
+    }
+    assertEquals(1, fileSchemeCount);
+  }
 }