cloudera软件包下载地址： http://archive.cloudera.com/cdh5/cdh/5/
flume用户教程：http://archive.cloudera.com/cdh5/cdh/5/flume-ng-1.6.0-cdh5.14.0/FlumeUserGuide.html
kafka: http://archive.apache.org/dist/kafka/
storm官网： http://storm.apache.org/
