Bigdata ideas

In previous post I show how to setup and configure  hadoop 3.0 simple cluster Now we can read and write into HDFS with Java: Create dir into HDFS (from master node) # hadoop fs -mkdir -p /user/data # hadoop fs -ls /user/data 2018-02-19 18:17:58,784 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform ... using builtin-java classes where applicable HadoopSimple.java package gdev; import java.io.BufferedWriter; import java.io.IOException; import java.io.OutputStream; import java.io.OutputStreamWriter; import org.apache.commons.io.IOUtils; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FSDataInputStream; import org.apache.hadoop.fs.FSDataOutputStream; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.Path; import org.apache.hadoop.util.Progressable; import org.apache.log4j.Logger; import java.net.URI; public class HadoopSimple { final static Logger logger = Logger.getLogger(HadoopSimple.cl

In this article presented step by step how create Hadoop cluster with 1 name node and 3 slaves. At first point there is one VM (from hardware administrator) with properties: 10.242.5.88 root/123456Qw # cat /etc/centos-release CentOS Linux release 7.1.1503 (Core) # uname -a Linux ders-hadoop1 3.10.0-229.el7.x86_64 #1 SMP Fri Mar 6 11:36:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux Storage information: Файловая система Размер Использовано Дост Использовано% Cмонтировано в /dev/mapper/centos-root 50G 914M 50G 2% / devtmpfs 1,9G 0 1,9G 0% /dev tmpfs 1,9G 0 1,9G 0% /dev/shm tmpfs 1,9G 8,3M 1,9G 1% /run tmpfs 1,9G 0 1,9G 0% /sys/fs/cgroup /dev/mapper/centos-home 73G 33M 73G 1% /home /dev/sda1 497M 11