Support LocalCacheFileSystem turn getFileBlockLocation request to ext…

…ernal file system (merge request !519)


Squash merge branch 'cacheFS-blockLocation' into 'tencent-master-dev'

* Support LocalCacheFileSystem turn getFileBlockLocation request to external file system

core/client/hdfs/src/main/java/alluxio/hadoop/LocalCacheFileSystem.java

@@ -26,6 +26,7 @@
 import alluxio.wire.FileInfo;
 
 import com.google.common.base.Preconditions;
+import org.apache.hadoop.fs.BlockLocation;
 import org.apache.hadoop.fs.FSDataInputStream;
 import org.apache.hadoop.fs.FSDataOutputStream;
 import org.apache.hadoop.fs.FileStatus;
@@ -205,4 +206,16 @@ public boolean mkdirs(Path f, FsPermission permission) throws IOException {
   public FileStatus getFileStatus(Path f) throws IOException {
     return mExternalFileSystem.getFileStatus(f);
   }
+
+  @Override
+  public BlockLocation[] getFileBlockLocations(FileStatus file, long start,
+      long len) throws IOException {
+    return mExternalFileSystem.getFileBlockLocations(file, start, len);
+  }
+
+  @Override
+  public BlockLocation[] getFileBlockLocations(Path p, long start, long len)
+      throws IOException {
+    return mExternalFileSystem.getFileBlockLocations(p, start, len);
+  }
 }