GOOK LUCK

作者近期与一位久未联系的朋友重新取得了联系,这位朋友主动发起了对话,并提到了之前曾推荐给作者的一首周杰伦的歌曲。两人聊得很愉快,尽管后来因为停电而中断了聊天。之后的日子里,他们通过消息继续交流,朋友还表达了想参加全国计算机等级考试的愿望。

it seems that i have good luck these days , because she contact me on her initiative . it had really seldom happened .

she sent a message said that she remember that she had ever introduced me a song by Jay .(<ground>搁浅) And she said the old songs seem are better than news . i was really surprised at that time, it is me who use to contact her first .Then we talked about the Text for a while , till the electric cut. It was December fifth two thousand and ten.

I was really happy that day and the next day .

 

after that we sent some message to each other . some times i first , some times she .and she told to me that she wants to attend the Nation Computer Level Text . it have nearly been half a year since we talk to each other last time.

 

not only being happy, i thought about more . Why contact me after i have fell into sad for some time finding that you are not concerned about me ? What is the contacting mean ?And how long would this situation last ?

 

We are just good friends , maybe just friends , probably it what she wants . Maybe friends is just want we both need . 

just friends i consider that.

第1关:HDFS Java API编程 ——文件读写 300 学习内容 参考答案 记录 评论 任务描述 相关知识 HDFS文件系统 HDFS文件创建和读写 编程要求 测试说明 任务描述 利用HDFS文件系统开放的API对HDFS系统进行文件的创建和读写 相关知识 HDFS文件系统 HDFS设计成能可靠地在集群中大量机器之间存储大量的文件,它以块序列的形式存储文件。文件中除了最后一个块,其他块都有相同的大小(一般64M)。属于文件的块为了故障容错而被复制到不同节点备份(备份数量有复制因子决定)。块的大小和读写是以文件为单位进行配置的。HDFS中的文件是一次写的,并且任何时候都只有一个写操作,但是可以允许多次读。 HDFS文件创建和读写 HDFS文件创建和操作可分为三个步骤: 获取FileSystem对象; Configuration conf = new Configuration();//configuration类实现hadoop各模块之间值的传递 FileSystem fs = FileSystem.get(conf); //获取文件系统 Path file = new Path(xxx); //创建文件 通过FSDataOutputStream进行写入; FSDataOutputStream outStream = fs.create(file); //获取输出流 outStream.writeUTF("XXX");//可以写入任意字符 outStream.close();//记得关闭输出流 通过FSDataInputStream将文件内容输出。 FSDataInputStream inStream = fs.open(file); //获取输入流 String data = inStream.readUTF(); //读取文件 编程要求 在右侧编辑器中补全代码,完成本关任务,具体要求如下: 获取hadoop的系统设置,并在其中创建HDFS文件,文件路径为/user/hadoop/myfile; 在myfile文件中添加字符串https://www.educoder.net; 读取刚刚创建myfile文件中的内容,并输出。 测试说明 本关的评测预设文件时/user/hadoop/myfile,所以创建文档的路径必须设置为/user/hadoop/myfile才能评测,否则会评测失败。 注:由于启动服务、编译等耗时,以及hdfs文件操作过程资源消耗较大且时间较长,因而评测时间较长,在40s左右. 实训使用软件环境为:JavaJDK1.8,hadoop2.7.4。 开始你的任务吧,gook luck
10-18
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值