Introduction The article will introduce Docker on CentOS. Key concepts Docker Docker is the world's leading software containerization platform. Docker is using union file systems which is a layered file system. When docker run a container, every imag…
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spark集群中的节点可以只处理自身独立数据库里的数据,然后汇总吗? 修改 我将spark搭建在两台机器上,其中一台既是master又是slave,另一台是slave,两台机器上均装有独立的mongodb数据库.我是否可以让它们只统计自身数据库的内容,然后将结果汇总到一台服务器上的数据库里?目前我的代码如下,但是最终只统计了master里的数据,另一个worker没有统计上. val config = new Configuration() //以下代码表示只统计本机数据库上的数据,猜测问题可能…
#数组的声明与遍历 animals=("a dog" "a cat" "a fish") #wrong ways to use this for i in ${animals[*]}; do echo $i; done for i in "${animals[*]}"; do echo $i; done #this is what we want correct way to use for i in "${anim…
