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From sur...@apache.org
Subject svn commit: r1401971 - in /hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs: FileSystem.java shell/FsCommand.java shell/SnapshotCommands.java
Date Thu, 25 Oct 2012 04:08:37 GMT
Author: suresh
Date: Thu Oct 25 04:08:36 2012
New Revision: 1401971

URL: http://svn.apache.org/viewvc?rev=1401971&view=rev
Log:
HDFS-4097. Provide CLI support for createSnapshot. Contributed by Brandon Li.

Added:
    hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/SnapshotCommands.java
Modified:
    hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java
    hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/FsCommand.java

Modified: hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java?rev=1401971&r1=1401970&r2=1401971&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java
(original)
+++ hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/FileSystem.java
Thu Oct 25 04:08:36 2012
@@ -2219,6 +2219,17 @@ public abstract class FileSystem extends
       ) throws IOException {
   }
 
+  /**
+   * Create a snapshot
+   * @param snapshotName The name of the snapshot
+   * @param snapshotRoot The directory where the snapshot will be taken
+   */
+  public void createSnapshot(String snapshotName, String snapshotRoot)
+      throws IOException {
+    throw new UnsupportedOperationException(getClass().getSimpleName()
+        + " doesn't support createSnapshot");
+  }
+  
   // making it volatile to be able to do a double checked locking
   private volatile static boolean FILE_SYSTEMS_LOADED = false;
 

Modified: hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/FsCommand.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/FsCommand.java?rev=1401971&r1=1401970&r2=1401971&view=diff
==============================================================================
--- hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/FsCommand.java
(original)
+++ hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/FsCommand.java
Thu Oct 25 04:08:36 2012
@@ -57,6 +57,7 @@ abstract public class FsCommand extends 
     factory.registerCommands(Tail.class);
     factory.registerCommands(Test.class);
     factory.registerCommands(Touch.class);
+    factory.registerCommands(SnapshotCommands.class);
   }
 
   protected FsCommand() {}

Added: hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/SnapshotCommands.java
URL: http://svn.apache.org/viewvc/hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/SnapshotCommands.java?rev=1401971&view=auto
==============================================================================
--- hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/SnapshotCommands.java
(added)
+++ hadoop/common/branches/HDFS-2802/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/shell/SnapshotCommands.java
Thu Oct 25 04:08:36 2012
@@ -0,0 +1,82 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.hadoop.fs.shell;
+
+import java.io.IOException;
+import java.util.LinkedList;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.classification.InterfaceStability;
+import org.apache.hadoop.fs.shell.PathExceptions.PathIsNotDirectoryException;
+
+/**
+ * Snapshot related operations
+ */
+@InterfaceAudience.Private
+@InterfaceStability.Unstable
+
+class SnapshotCommands extends FsCommand {
+  private final static String CREATE_SNAPSHOT = "createSnapshot";
+  
+  public static void registerCommands(CommandFactory factory) {
+    factory.addClass(CreateSnapshot.class, "-" + CREATE_SNAPSHOT);
+  }
+  
+  /**
+   *  Create a snapshot
+   */
+  public static class CreateSnapshot extends FsCommand {
+    public static final String NAME = CREATE_SNAPSHOT;
+    public static final String USAGE = "<snapshotName> <snapshotRoot>";
+    public static final String DESCRIPTION = "Create a snapshot on a directory";
+
+    private static String snapshotName;
+
+    @Override
+    protected void processPath(PathData item) throws IOException {
+      if (!item.stat.isDirectory()) {
+        throw new PathIsNotDirectoryException(item.toString());
+      }
+    }
+    
+    @Override
+    protected void processOptions(LinkedList<String> args) throws IOException {
+      if (args.size() != 2) {
+        throw new IOException("args number not 2:" + args.size());
+      }
+      snapshotName = args.removeFirst();
+      // TODO: name length check  
+
+    }
+
+    @Override
+    protected void processArguments(LinkedList<PathData> items)
+    throws IOException {
+      super.processArguments(items);
+      if (exitCode != 0) { // check for error collecting paths
+        return;
+      }
+      assert(items.size() == 1);
+      PathData sroot = items.getFirst();
+      String snapshotRoot = sroot.path.toString();
+      sroot.fs.createSnapshot(snapshotName, snapshotRoot);
+    }    
+  }
+}
+



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