anchor.diff:      rm -rf spark-2.1.3-bin-hadoop2.7.tgz
   
   RUN cd /home/jenkins && \
  -    wget http://mirrors.ocf.berkeley.edu/apache/spark/spark-2.1.2/spark-2.1.2-bin-hadoop2.7.tgz  && \
  +    wget http://archive.apache.org/dist/spark/spark-2.1.2/spark-2.1.2-bin-hadoop2.7.tgz  && \
       mkdir -p spark-2.1.2-bin-hadoop2.7 &&  \
       tar zxvf spark-2.1.2-bin-hadoop2.7.tgz -C spark-2.1.2-bin-hadoop2.7 --strip-components 1 && \
       rm -rf spark-2.1.2-bin-hadoop2.7.tgz
  
positive.code:     rm -rf spark-2.2.2-bin-hadoop2.7.tgz
  
  RUN cd /home/jenkins && \
      wget http://mirrors.ocf.berkeley.edu/apache/spark/spark-2.2.1/spark-2.2.1-bin-hadoop2.7.tgz  && \
      mkdir -p spark-2.2.1-bin-hadoop2.7 &&  \
      tar zxvf spark-2.2.1-bin-hadoop2.7.tgz -C spark-2.2.1-bin-hadoop2.7 --strip-components 1 && \
      rm -rf spark-2.2.1-bin-hadoop2.7.tgz
  
negative.code:     rm -rf spark-2.3.1-bin-hadoop2.7.tgz
  
  RUN cd /home/jenkins && \
      wget http://archive.apache.org/dist/spark/spark-2.3.0/spark-2.3.0-bin-hadoop2.7.tgz  && \
      mkdir -p spark-2.3.0-bin-hadoop2.7 &&  \
      tar zxvf spark-2.3.0-bin-hadoop2.7.tgz -C spark-2.3.0-bin-hadoop2.7 --strip-components 1 && \
      rm -rf spark-2.3.0-bin-hadoop2.7.tgz
  