multiple worker
multiple worker

ondra-m/ruby-spark,ondra-m/ruby-spark,tomz/ruby-spark,tomz/ruby-spark,tomz/ruby-spark,ondra-m/ruby-spark,ondra-m/ruby-spark,tomz/ruby-spark,tomz/ruby-spark,ondra-m/ruby-spark,ondra-m/ruby-spark,tomz/ruby-spark