HBASE-13250 chown of ExportSnapshot does not cover all path and files…

… (He Liangliang)

hbase-server/src/main/java/org/apache/hadoop/hbase/snapshot/ExportSnapshot.java

@@ -271,7 +271,7 @@ private void copyFile(final Context context, final SnapshotFileInfo inputInfo,
         context.getCounter(Counter.BYTES_EXPECTED).increment(inputStat.getLen());
 
         // Ensure that the output folder is there and copy the file
-        outputFs.mkdirs(outputPath.getParent());
+        createOutputPath(outputPath.getParent());
         FSDataOutputStream out = outputFs.create(outputPath, true);
         try {
           copyData(context, inputStat.getPath(), in, outputPath, out, inputStat.getLen());
@@ -288,6 +288,23 @@ private void copyFile(final Context context, final SnapshotFileInfo inputInfo,
       }
     }
 
+    /**
+     * Create the output folder and optionally set ownership.
+     */
+    private void createOutputPath(final Path path) throws IOException {
+      if (filesUser == null && filesGroup == null) {
+        outputFs.mkdirs(path);
+      } else {
+        Path parent = path.getParent();
+        if (!outputFs.exists(parent) && !parent.isRoot()) {
+          createOutputPath(parent);
+        }
+        outputFs.mkdirs(path);
+        // override the owner when non-null user/group is specified
+        outputFs.setOwner(path, filesUser, filesGroup);
+      }
+    }
+
     /**
      * Try to Preserve the files attribute selected by the user copying them from the source file
      * This is only required when you are exporting as a different user than "hbase" or on a system
@@ -802,6 +819,21 @@ private void verifySnapshot(final Configuration baseConf,
     SnapshotReferenceUtil.verifySnapshot(conf, fs, snapshotDir, snapshotDesc);
   }
 
+  /**
+   * Set path ownership.
+   */
+  private void setOwner(final FileSystem fs, final Path path, final String user,
+      final String group, final boolean recursive) throws IOException {
+    if (user != null || group != null) {
+      if (recursive && fs.isDirectory(path)) {
+        for (FileStatus child : fs.listStatus(path)) {
+          setOwner(fs, child.getPath(), user, group, recursive);
+        }
+      }
+      fs.setOwner(path, user, group);
+    }
+  }
+
   /**
    * Execute the export snapshot by copying the snapshot metadata, hfiles and wals.
    * @return 0 on success, and != 0 upon failure.
@@ -925,6 +957,9 @@ public int run(String[] args) throws IOException {
     try {
       LOG.info("Copy Snapshot Manifest");
       FileUtil.copy(inputFs, snapshotDir, outputFs, initialOutputSnapshotDir, false, false, conf);
+      if (filesUser != null || filesGroup != null) {
+        setOwner(outputFs, snapshotTmpDir, filesUser, filesGroup, true);
+      }
     } catch (IOException e) {
       throw new ExportSnapshotException("Failed to copy the snapshot directory: from=" +
         snapshotDir + " to=" + initialOutputSnapshotDir, e);