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A Java virtual machine is a program which executes certain other programs, namely those containing Java bytecode instructions. JVMs are most often implemented to run on an existingoperating system, but can also be implemented to run directly on hardware. A JVM provides an environment in which Java b 阅读全文
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学习了hadoop这几天,一些主要的概念必须得先弄清楚,下面是来自wiki.apache的一些很好的解释,整理如下: 本文信息来源:http://wiki.apache.org/hadoop/FrontPage1. NameNode The NameNode is the centerpiece of an HDFS file system. It keeps the directory tree of all files in the file system, and tracks where across the cluster the file data is kept. It ... 阅读全文
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(1).在debian下默认的浏览器中输入网址时是要加www的,例如baidu.com就不行,他不认,你要写www.baidu.com;害得我还以为配置文件出了问题,改了又改,重启了eth0 n次。(2).如果在使用ssh无密码登录时出现如下出错信息,可以这样解决:之前要在本机上装上ssh,可以通过sudo apt-get install ssh或者通过新立德来安装。如果没有进行配置的话,登录到本机或者远程主机需要该主机的密码才行。下面进行无密码登录的配置:很简单,执行ssh-keygen -t rsa命令,一路敲回车就行了,就在.ssh文件夹下生成了2个文件,一个公钥和一个私钥文件, id_ 阅读全文