anchor.diff:      rsync \
       ssh \
       wget
  +
  +ENV HADOOP_PREFIX /opt/hadoop
  +ENV HADOOP_CONF_DIR ${HADOOP_PREFIX}/etc/hadoop
  +ENV HADOOP_DATA_DIR /var/lib/hadoop
  +ENV PATH ${HADOOP_PREFIX}/bin:$PATH
  +ENV HADOOP_VERSION 3.0.0-SNAPSHOT
   
   # Download hadoop
   RUN curl -SL https://s3.amazonaws.com/hadoop-distribution/hadoop-${HADOOP_VERSION}.tar.gz \
  
positive.code: MAINTAINER Meng Ding <dingmeng@gmail.com>
  
  USER root
  
  ENV HADOOP_VERSION 3.0.0-SNAPSHOT
  ENV HADOOP_PREFIX /opt/hadoop
  ENV HADOOP_CONF_DIR ${HADOOP_PREFIX}/etc/hadoop
  ENV HADOOP_DATA_DIR /var/lib/hadoop
  ENV PATH ${HADOOP_PREFIX}/bin:$PATH
  
  # Install all dependencies
  RUN apt-get update && apt-get install -y \
  
negative.code: 
  ENV ZK_PREFIX /opt/zookeeper
  ENV ZK_CONF_DIR $ZK_PREFIX/conf
  ENV ZK_VERSION 3.4.7
  ENV PATH ${ZK_PREFIX}/bin:$PATH
  
  # Download zookeeper
  