This tutorial help you to learn to manage our files in HDFS. You will learn how to create, upload, download and list contents in HDFS. Below commands will help you to how to create directory structure in HDFS, Copy files from local file system to HDFS and download files from HDFS to local files....
Sometimes you faced issue with Hadoop cluster setup on system with listing filesystem like ls: ‘.’: No such file or directory’. This issue occurs because of there is no home directory created on HDFS for your current user. In order to resolve this issue create the home directory on HDFS. For example, you are...
Namenode loads the filesystem state from fsimage and stays in safe mode and wait for data nodes to report their blocks. Safemode is a read-only mode for HDFS cluster, so that it does not prematurely start replicating the blocks. Use following command to let the namenode leave safemode forcefully. $ hadoop dfsadmin -safemode leave...
This tutorial will help you to run a wordcount mapreduce example in hadoop using command line. This can be also an initial test for your Hadoop setup testing. 1. Prerequisites You must have running hadoop setup on your system. If you don’t have hadoop installed visit Hadoop installation on Linux tutorial. 2. Copy Files...
Apache Hadoop 3.1 have noticeable improvements any many bug fixes over the previous stable 3.0 releases. This version has many improvements in HDFS and MapReduce. This how-to guide will help you to setup Hadoop 3.1.0 Single-Node Cluster on CentOS/RHEL 7/6/5, Ubuntu 18.04, 17.10, 16.04 & 14.04, Debian 9/8/7 and LinuxMint Systems. This article has...
Apache Hadoop 2.6.5 noticeable improvements over the previous stable 2.X.Y releases. This version has many improvements in HDFS and MapReduce. This how-to guide will help you to install Hadoop 2.6 on CentOS/RHEL 7/6/5, Ubuntu and other Debian-based operating system. This article doesn’t include the overall configuration to setup Hadoop, we have only basic configuration...
The Apache Hadoop software library is a framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models. Our earlier article about hadoop was describing to how to setup single node cluster. This article will help you for step by step installing and configuring Hadoop Multi-Node...