fs

hdfs具体的安装方法参考前文（cm5.4和cdh5.4安装http://my.oschina.net/penngo/blog/517223） 这里只介绍java对hdfs文件系统的操作，下图是需要用到的包(这里包括hbase相关包) import java.io.IOException; import java.net.URI; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FSDataInputStream; import org.apache.hadoop.fs.FSDataOutputStream; import org.apache.hadoop.fs.FileStatus; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; public class HdfsTest { private FileSystem fileSystem = null; private Configuration config = null; public HdfsTest() { } public void connect() throws Exception { String uri =

HDFS HDFS组成架构 HDFS文 件块大小 HDFS Shell ） 1 bin/hadoop fs dfsfs实现 2．命令 $ bin/hadoop fs [-appendToFile <localsrc> ... <dst>] [-cat [-ignoreCrc] <src> ...] [-checksum <src> ...] [-chgrp [-R] GROUP PATH...] [-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...] [-chown [-R] [OWNER][:[GROUP]] PATH...] [-copyFromLocal [-f] [-p] <localsrc> ... <dst>] [-copyToLocal [-p] [-ignoreCrc] [-crc] <src> ... <localdst>] [-count [-q] <path> ...] [-cp [-f] [-p] <src> ... <dst>] [-createSnapshot <snapshotDir> [<snapshotName>]] [-deleteSnapshot <snapshotDir> <snapshotName>] [-df [-h] [<path> ...]] [-du [-s] [-h] <path> .

//mkdir.js const fs=require('fs'); const dirCache={}; function mkdir(filepath) { const arr=filepath.split('/'); let dir=arr[0]; for(let i=1;i<arr.length;i++){ if(!dirCache[dir]&&!fs.existsSync(dir)){ dirCache[dir]=true; fs.mkdirSync(dir); } dir=dir+'/'+arr[i]; } } module.exports=mkdir;

I'm trying to save an image download with the request module. With this request('http://google.com/images/logos/ps_logo2.png').pipe(fs.createWriteStream('doodle.png')); It works fine. But I want to be able to do something else after the image has been completely downloaded. How can provide a callback function to fs.createWriteStream ? You want to create the stream ahead of time and then do something on the close event. var picStream = fs.createWriteStream('doodle.png'); picStream.on('close', function() { console.log('file done'); }); request('http://google.com/images/logos/ps_logo2.png').pipe

So basically I want to delete string from txt file. using fs Input Example: string1 string2 string3 string4 Delete string3 After delete It would be like: string1 string2 string4 Read the text file get the content in a variable then use String.replace For example var stringContent="Here goes the content of the textFile after read" var res=stringContent.replace('string3',''); //write back res to the file or do what ever As brk answered, replace method on string will do the job. Another way is var a = new Array(); a = string.split("searching_string"); string = a.join(""); Think it should work.

I have a little website in node.js, when a people want to sign up we call a function (a external file) here the part where i write the JSON : { nouveauMembre = {}; nouveauMembre.pseudo = query.pseudo; nouveauMembre.password = query.password; listeMembre[listeMembre.length] = nouveauMembre; contenu_fichier = JSON.stringify(listeMembre); fs.writeFileSync("membres.json", contenu_fichier, 'utf-8'); } we write the pseudo and password in the JSON menbres.json but i want to write another file wich is call the actual pseudo selected (the query) so i write : nouveauMembre = {}; nouveauMembre.pseudo =

This question already has an answer here: Why is my variable unaltered after I modify it inside of a function? - Asynchronous code reference 6 answers #!/usr/bin/env node var fs = require('fs') , async = require('async') , program = require('commander') program .version('0.0.1') .usage('<keywords>') .parse(process.argv) async.waterfall([ fs.readdir.bind(fs, __dirname), parseHTML, ], saveResult) function parseHTML(files, callback) { var result = [] files.forEach(function(file) { if (file.match(/\.html$/)) { fs.readFile(file, 'utf8', function(err, data) { if (err) throw err result.push(data) })

Please, could you help me? I would like to save an image, that is encoded in base64, using base64. I have tried this : var image = "data:image/jpeg;base64,/9j/4AAQSkZJRgABAgAAAQABAAD/7QCcUGhvdG9zaG9wIDMuMAA4QklNBAQAAAAAAIAcAmcAFFd6cEFHZWltVEJyLURXbzBWeFlNHAIoAGJGQk1EMDEwMDBhYzAwMzAwMDBlOTA5MDAwMDRjMTIwMDAwOWMxMzAwMDAwNTE1MDAwMDlhMTkwMDAwOGMyMzAwMDBjNDI0MDAwMDRkMjYwMDAwZDkyNzAwMDBjYTM4MDAwMP

I am using tail-stream to get data from a csv file and converting each csv record to json format and printing it. But tail-stream is not printing the last line of the file it is keeping it as a buffer, and if I update the file all the rows from previous last(the buffered last row) row to updated last row(excluding last row) are printed, its again storing the latest last row in buffer So is this the behavior of the tail-stream or is there any wrong in my code https://www.npmjs.com/package/tail-stream My code: var tailStream = require('tail-stream'); var Converter = require("csvtojson")