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...
Apache Hadoop 2.8 have noticeable improvements over the previous stable 2.7 releases. This version has many improvements in HDFS and MapReduce. This how-to guide will help you to setup Hadoop 2.8.0 Single-Node Cluster on CentOS/RHEL 7/6/5, Ubuntu 17.04 / 16.04 / 14.04, Debian 8/7 and LinuxMint Systems. This article has been tested with Ubuntu...
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...