public?static?class?Map?extends?Mapper<Object,?Text,?Text,?Text>?{

		private?Text?outKey?=?new?Text();
		private?Text?outValue?=?new?Text();
		private?List<String>?cacheList?=?new?ArrayList<String>();?
		@Override
		protected?void?setup(Mapper<Object,?Text,?Text,?Text>.Context?context)
				throws?IOException,?InterruptedException?{
		super.setup(context);
			Path?smallTablePath?=?new?Path(context.getConfiguration().get("smallTableLocation"));
			FileSystem?hdfs?=?smallTablePath.getFileSystem(context.getConfiguration());
			FSDataInputStream?hdfsReader?=?hdfs.open(smallTablePath);
			Text?line?=?new?Text();
			LineReader?lineReader?=?new?LineReader(hdfsReader);
		
			while(lineReader.readLine(line)?>?0)?{
				String[]?values?=?line.toString().split("\n");
				for?(int?i?=?0;?i?<?values.length;?i++)?{
					cacheList.add(values[i]);

				}
				
			}
			lineReader.close();
			hdfsReader.close();
			System.out.println("setup?ok");
			
		}
		@Override
		public?void?map(Object?key,?Text?value,?Context?context)?throws?IOException,?InterruptedException?{
			String?row_matrix1?=value.toString().split("?")[0];
		
			String[]?column_value_array_matrix1?=value.toString().split("?")[1].split(",");
			for(String?line:cacheList)?{
				String?row_matrix2?=?line.toString().split("\t")[0];
			
				String[]?column_value_array_matrix2?=?line.toString().split("\t")[1].split(",");
				
				int?result=?0;
				for(String?column_value_matrix1:column_value_array_matrix1)?{
					String?column_matrix1?=?column_value_matrix1.split("_")[0];
					String?value_matrix1?=?column_value_matrix1.split("_")[1];
					for(String?column_value_matrix2:column_value_array_matrix2)?{
						if(column_value_matrix2.startsWith(column_matrix1+"_"))?{
							String?value_matrix2?=?column_value_matrix2.split("_")[1];
							result?+=Integer.valueOf(value_matrix1)*Integer.valueOf(value_matrix2);
							
						}
					}
					
				}
			
				outKey.set(row_matrix1);
				outValue.set(row_matrix2+"_"+result);
				System.out.println(outValue);
				context.write(outKey,?outValue);
				
			}

		}


	}