HADOOP-9631. ViewFs should use underlying FileSystem's server side defaults. Contributed by Lohit Vijayarenu and Erik Krogen.

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

@@ -450,9 +450,21 @@ public Path getHomeDirectory() {
    * @return server default configuration values
    * 
    * @throws IOException an I/O error occurred
+   * @deprecated use {@link #getServerDefaults(Path)} instead
    */
+  @Deprecated
   public abstract FsServerDefaults getServerDefaults() throws IOException; 
 
+  /**
+   * Return a set of server default configuration values based on path.
+   * @param f path to fetch server defaults
+   * @return server default configuration values for path
+   * @throws IOException an I/O error occurred
+   */
+  public FsServerDefaults getServerDefaults(final Path f) throws IOException {
+    return getServerDefaults();
+  }
+
   /**
    * Return the fully-qualified path of path f resolving the path
    * through any internal symlinks or mount point
@@ -548,7 +560,7 @@ public final FSDataOutputStream create(final Path f,
     }
 
 
-    FsServerDefaults ssDef = getServerDefaults();
+    FsServerDefaults ssDef = getServerDefaults(f);
     if (ssDef.getBlockSize() % ssDef.getBytesPerChecksum() != 0) {
       throw new IOException("Internal error: default blockSize is" + 
           " not a multiple of default bytesPerChecksum ");
@@ -626,7 +638,7 @@ public abstract boolean delete(final Path f, final boolean recursive)
    */
   public FSDataInputStream open(final Path f) throws AccessControlException,
       FileNotFoundException, UnresolvedLinkException, IOException {
-    return open(f, getServerDefaults().getFileBufferSize());
+    return open(f, getServerDefaults(f).getFileBufferSize());
   }
 
   /**

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

@@ -57,7 +57,7 @@ public ChecksumFs(AbstractFileSystem theFs)
     throws IOException, URISyntaxException {
     super(theFs);
     defaultBytesPerChecksum = 
-      getMyFs().getServerDefaults().getBytesPerChecksum();
+      getMyFs().getServerDefaults(new Path("/")).getBytesPerChecksum();
   }
   
   /**
@@ -96,9 +96,10 @@ public int getBytesPerSum() {
     return defaultBytesPerChecksum;
   }
 
-  private int getSumBufferSize(int bytesPerSum, int bufferSize)
+  private int getSumBufferSize(int bytesPerSum, int bufferSize, Path file)
     throws IOException {
-    int defaultBufferSize =  getMyFs().getServerDefaults().getFileBufferSize();
+    int defaultBufferSize = getMyFs().getServerDefaults(file)
+        .getFileBufferSize();
     int proportionalBufferSize = bufferSize / bytesPerSum;
     return Math.max(bytesPerSum,
                     Math.max(proportionalBufferSize, defaultBufferSize));
@@ -121,7 +122,7 @@ private static class ChecksumFSInputChecker extends FSInputChecker {
     
     public ChecksumFSInputChecker(ChecksumFs fs, Path file)
       throws IOException, UnresolvedLinkException {
-      this(fs, file, fs.getServerDefaults().getFileBufferSize());
+      this(fs, file, fs.getServerDefaults(file).getFileBufferSize());
     }
     
     public ChecksumFSInputChecker(ChecksumFs fs, Path file, int bufferSize)
@@ -132,7 +133,7 @@ public ChecksumFSInputChecker(ChecksumFs fs, Path file, int bufferSize)
       Path sumFile = fs.getChecksumFile(file);
       try {
         int sumBufferSize = fs.getSumBufferSize(fs.getBytesPerSum(),
-                                                bufferSize);
+            bufferSize, file);
         sums = fs.getRawFs().open(sumFile, sumBufferSize);
 
         byte[] version = new byte[CHECKSUM_VERSION.length];
@@ -353,7 +354,7 @@ public ChecksumFSOutputSummer(final ChecksumFs fs, final Path file,
       
       // Now create the chekcsumfile; adjust the buffsize
       int bytesPerSum = fs.getBytesPerSum();
-      int sumBufferSize = fs.getSumBufferSize(bytesPerSum, bufferSize);
+      int sumBufferSize = fs.getSumBufferSize(bytesPerSum, bufferSize, file);
       this.sums = fs.getRawFs().createInternal(fs.getChecksumFile(file),
           EnumSet.of(CreateFlag.CREATE, CreateFlag.OVERWRITE),
           absolutePermission, sumBufferSize, replication, blockSize, progress,

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

@@ -149,10 +149,16 @@ public FsStatus getFsStatus(final Path f) throws IOException {
   }
 
   @Override
+  @Deprecated
   public FsServerDefaults getServerDefaults() throws IOException {
     return fsImpl.getServerDefaults();
   }
   
+  @Override
+  public FsServerDefaults getServerDefaults(final Path f) throws IOException {
+    return fsImpl.getServerDefaults(f);
+  }
+
   @Override
   public Path getHomeDirectory() {
     return fsImpl.getHomeDirectory();

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

@@ -147,10 +147,15 @@ public FsStatus getFsStatus() throws IOException {
   }
 
   @Override
+  @Deprecated
   public FsServerDefaults getServerDefaults() throws IOException {
     return myFs.getServerDefaults();
   }
   
+  @Override
+  public FsServerDefaults getServerDefaults(final Path f) throws IOException {
+    return myFs.getServerDefaults(f);
+  }
 
   @Override
   public Path resolvePath(final Path p) throws FileNotFoundException,

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

@@ -29,6 +29,7 @@
 import org.apache.hadoop.fs.DelegateToFileSystem;
 import org.apache.hadoop.fs.FsConstants;
 import org.apache.hadoop.fs.FsServerDefaults;
+import org.apache.hadoop.fs.Path;
 
 /**
  * The FtpFs implementation of AbstractFileSystem.
@@ -57,7 +58,13 @@ public int getUriDefaultPort() {
   }
   
   @Override
+  @Deprecated
   public FsServerDefaults getServerDefaults() throws IOException {
     return FtpConfigKeys.getServerDefaults();
   }
+
+  @Override
+  public FsServerDefaults getServerDefaults(final Path f) throws IOException {
+    return FtpConfigKeys.getServerDefaults();
+  }
 }

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

@@ -28,6 +28,7 @@
 import org.apache.hadoop.fs.DelegateToFileSystem;
 import org.apache.hadoop.fs.FsConstants;
 import org.apache.hadoop.fs.FsServerDefaults;
+import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.RawLocalFileSystem;
 
 /**
@@ -63,6 +64,13 @@ public int getUriDefaultPort() {
   }
   
   @Override
+  public FsServerDefaults getServerDefaults(final Path f)
+      throws IOException {
+    return LocalConfigKeys.getServerDefaults();
+  }
+
+  @Override
+  @Deprecated
   public FsServerDefaults getServerDefaults() throws IOException {
     return LocalConfigKeys.getServerDefaults();
   }

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

@@ -223,10 +223,16 @@ public FsStatus getFsStatus() throws IOException {
   }
 
   @Override
+  @Deprecated
   public FsServerDefaults getServerDefaults() throws IOException {
     return myFs.getServerDefaults();
   }
 
+  @Override
+  public FsServerDefaults getServerDefaults(final Path f) throws IOException {
+    return myFs.getServerDefaults(fullPath(f));
+  }
+
   @Override
   public int getUriDefaultPort() {
     return myFs.getUriDefaultPort();

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

@@ -240,10 +240,22 @@ AbstractFileSystem getTargetFileSystem(URI[] mergeFsURIList)
   }
 
   @Override
+  @Deprecated
   public FsServerDefaults getServerDefaults() throws IOException {
     return LocalConfigKeys.getServerDefaults(); 
   }
 
+  @Override
+  public FsServerDefaults getServerDefaults(final Path f) throws IOException {
+    InodeTree.ResolveResult<AbstractFileSystem> res;
+    try {
+      res = fsState.resolve(getUriPath(f), true);
+    } catch (FileNotFoundException fnfe) {
+      return LocalConfigKeys.getServerDefaults();
+    }
+    return res.targetFileSystem.getServerDefaults(res.remainingPath);
+  }
+
   @Override
   public int getUriDefaultPort() {
     return -1;
@@ -927,8 +939,14 @@ public FsStatus getFsStatus() {
     }
 
     @Override
+    @Deprecated
     public FsServerDefaults getServerDefaults() throws IOException {
-      throw new IOException("FsServerDefaults not implemented yet");
+      return LocalConfigKeys.getServerDefaults();
+    }
+
+    @Override
+    public FsServerDefaults getServerDefaults(final Path f) throws IOException {
+      return LocalConfigKeys.getServerDefaults();
     }
 
     @Override

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

@@ -117,6 +117,7 @@ public FsStatus getFsStatus() throws IOException {
     }
 
     @Override
+    @Deprecated
     public FsServerDefaults getServerDefaults() throws IOException {
       // deliberately empty
       return null;

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

@@ -39,6 +39,7 @@
 import java.net.URISyntaxException;
 import java.security.PrivilegedExceptionAction;
 import java.util.ArrayList;
+import java.util.EnumSet;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -46,8 +47,10 @@
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.AbstractFileSystem;
 import org.apache.hadoop.fs.BlockLocation;
+import org.apache.hadoop.fs.CreateFlag;
 import org.apache.hadoop.fs.FileContext;
 import org.apache.hadoop.fs.FileContextTestHelper;
+import org.apache.hadoop.fs.FsServerDefaults;
 import org.apache.hadoop.fs.LocatedFileStatus;
 import org.apache.hadoop.fs.RemoteIterator;
 import org.apache.hadoop.fs.FileContextTestHelper.fileType;
@@ -55,6 +58,7 @@
 import org.apache.hadoop.fs.FsConstants;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.UnresolvedLinkException;
+import org.apache.hadoop.fs.local.LocalConfigKeys;
 import org.apache.hadoop.fs.permission.AclEntry;
 import org.apache.hadoop.fs.permission.AclStatus;
 import org.apache.hadoop.fs.permission.AclUtil;
@@ -839,6 +843,51 @@ public Object run() throws IOException, URISyntaxException {
     });
   }
 
+  @Test
+  public void testRespectsServerDefaults() throws Exception {
+    FsServerDefaults targetDefs =
+        fcTarget.getDefaultFileSystem().getServerDefaults(new Path("/"));
+    FsServerDefaults viewDefs =
+        fcView.getDefaultFileSystem().getServerDefaults(new Path("/data"));
+    assertEquals(targetDefs.getReplication(), viewDefs.getReplication());
+    assertEquals(targetDefs.getBlockSize(), viewDefs.getBlockSize());
+    assertEquals(targetDefs.getBytesPerChecksum(),
+        viewDefs.getBytesPerChecksum());
+    assertEquals(targetDefs.getFileBufferSize(),
+        viewDefs.getFileBufferSize());
+    assertEquals(targetDefs.getWritePacketSize(),
+        viewDefs.getWritePacketSize());
+    assertEquals(targetDefs.getEncryptDataTransfer(),
+        viewDefs.getEncryptDataTransfer());
+    assertEquals(targetDefs.getTrashInterval(), viewDefs.getTrashInterval());
+    assertEquals(targetDefs.getChecksumType(), viewDefs.getChecksumType());
+
+    fcView.create(new Path("/data/file"), EnumSet.of(CreateFlag.CREATE))
+        .close();
+    FileStatus stat =
+        fcTarget.getFileStatus(new Path(targetTestRoot, "data/file"));
+    assertEquals(targetDefs.getReplication(), stat.getReplication());
+  }
+
+  @Test
+  public void testServerDefaultsInternalDir() throws Exception {
+    FsServerDefaults localDefs = LocalConfigKeys.getServerDefaults();
+    FsServerDefaults viewDefs = fcView
+        .getDefaultFileSystem().getServerDefaults(new Path("/internalDir"));
+    assertEquals(localDefs.getReplication(), viewDefs.getReplication());
+    assertEquals(localDefs.getBlockSize(), viewDefs.getBlockSize());
+    assertEquals(localDefs.getBytesPerChecksum(),
+        viewDefs.getBytesPerChecksum());
+    assertEquals(localDefs.getFileBufferSize(),
+        viewDefs.getFileBufferSize());
+    assertEquals(localDefs.getWritePacketSize(),
+        viewDefs.getWritePacketSize());
+    assertEquals(localDefs.getEncryptDataTransfer(),
+        viewDefs.getEncryptDataTransfer());
+    assertEquals(localDefs.getTrashInterval(), viewDefs.getTrashInterval());
+    assertEquals(localDefs.getChecksumType(), viewDefs.getChecksumType());
+  }
+
   // Confirm that listLocatedStatus is delegated properly to the underlying
   // AbstractFileSystem to allow for optimizations
   @Test

hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/fs/Hdfs.java

@@ -155,10 +155,16 @@ public FsStatus getFsStatus() throws IOException {
   }
 
   @Override
+  @Deprecated
   public FsServerDefaults getServerDefaults() throws IOException {
     return dfs.getServerDefaults();
   }
 
+  @Override
+  public FsServerDefaults getServerDefaults(final Path f) throws IOException {
+    return dfs.getServerDefaults();
+  }
+
   @Override
   public RemoteIterator<LocatedFileStatus> listLocatedStatus(
       final Path p)