code: public void checkSrcFile(FileSystem srcFs, FileStatus srcFile) 
    		throws IOException {
    	List<BlockInfo> srcBlocks = getBlockInfos(srcFs, srcFile);
    	if (srcBlocks.size() == 0) {
    		return;
    	}
    	
    	BlockAndDatanodeResolver resolver = new BlockAndDatanodeResolver(srcFile.getPath(), srcFs);
    	checkSrcBlockLocations(srcBlocks, srcFile, resolver);
    }
docs: Check the block placement info of the src file only.
  (This is used for non-raided file)
  @throws IOException