to let the output file name unique so that we can import it easily
to let the output file name unique so that we can import it easily

ykwd/thrift,ykwd/thrift,ykwd/thrift,ykwd/thrift,ykwd/thrift,ykwd/thrift,ykwd/thrift,ykwd/thrift,ykwd/thrift,ykwd/thrift,ykwd/thrift,ykwd/thrift