HADOOP-11432. Fix SymlinkBaseTest#testCreateLinkUsingPartQualPath2. (Liang Xie via gera)

(cherry picked from commit 26c2de36e2dd1b2ddedc155e49fb2ec31366d5f8)

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

@@ -449,6 +449,9 @@ Release 2.7.0 - UNRELEASED
     HADOOP-11523. StorageException complaining " no lease ID" when updating
     FolderLastModifiedTime in WASB. (Duo Xu via cnauroth)
 
+    HADOOP-11432. Fix SymlinkBaseTest#testCreateLinkUsingPartQualPath2.
+    (Liang Xie via gera)
+
 Release 2.6.1 - UNRELEASED
 
   INCOMPATIBLE CHANGES

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

@@ -45,12 +45,13 @@ import org.apache.hadoop.fs.permission.AclEntry;
 import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.FsAction;
 import org.apache.hadoop.fs.permission.FsPermission;
-import org.apache.hadoop.fs.InvalidPathException;
 import org.apache.hadoop.security.AccessControlException;
 import org.apache.hadoop.security.SecurityUtil;
 import org.apache.hadoop.security.token.Token;
 import org.apache.hadoop.util.Progressable;
 
+import com.google.common.annotations.VisibleForTesting;
+
 /**
  * This class provides an interface for implementors of a Hadoop file system
  * (analogous to the VFS of Unix). Applications do not access this class;
@@ -79,6 +80,9 @@ public abstract class AbstractFileSystem {
   
   /** The statistics for this file system. */
   protected Statistics statistics;
+
+  @VisibleForTesting
+  static final String NO_ABSTRACT_FS_ERROR = "No AbstractFileSystem configured for scheme";
   
   private final URI myUri;
   
@@ -154,8 +158,8 @@ public abstract class AbstractFileSystem {
     Class<?> clazz = conf.getClass(fsImplConf, null);
     if (clazz == null) {
       throw new UnsupportedFileSystemException(String.format(
-          "%s=null: No AbstractFileSystem configured for scheme: %s",
-          fsImplConf, uri.getScheme()));
+          "%s=null: %s: %s",
+          fsImplConf, NO_ABSTRACT_FS_ERROR, uri.getScheme()));
     }
     return (AbstractFileSystem) newInstance(clazz, uri, conf);
   }

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

@@ -582,7 +582,7 @@ public abstract class SymlinkBaseTest {
       // Expected
       if (wrapper instanceof FileContextTestWrapper) {
         GenericTestUtils.assertExceptionContains(
-            "No AbstractFileSystem configured for scheme: null", e);
+            AbstractFileSystem.NO_ABSTRACT_FS_ERROR, e);
       } else if (wrapper instanceof FileSystemTestWrapper) {
         assertEquals("No FileSystem for scheme: null", e.getMessage());
       }