you can use Cloudera VMware that has preinstalled Hadoop, or you can use Oracle VirtualBox or the VMware Workstation. In this tutorial, I will be demonstrating the installation process for Hadoop using the VMware Workstation 12. You can use any of the above to perform the installation...
Backup of important data: As this process can result in data loss stored in HDFS (Hadoop Distributed File System), you need to back up all important files. To do that, transfer or copy data from HDFS to a local or external storage system. You can use HDFS commands such as:hdfs...
We investigated the issue and found that the cause to be one to the utilities installed on the machine had accidentally get ran “update-rc.d” on the problematic host. Which caused the removal of all the Hadoop related packages and libraries from the reported host under the/usr/hd...
Site-specific configuration –Which includesetc/hadoop/core-site.xml, etc/hadoop/hdfs-site.xml, etc/hadoop/yarn-site.xml and etc/hadoop/mapred-site.xml. In order to configure it you have to configure the environment in which the daemons execute and also the configuration parameters for its ...
Hadoop requires Java to be installed, so let’s begin by installing Java: apt-get update apt-get install default-jdk These commands will update the package information on your VPS and then install Java. After executing these commands, execute the following command to verify that Java has been...
4. Execute hadoop archive commands sudo -u hdfs hadoop archive -archiveName hartest2.har -p /tmp harSourceFolder2 /tmp/harDestinationFolder2 5. Capture fsck report across the "/" and NN report after after hadoop archives are created. ...
HiveALTER TABLEcommand is used to update or drop a partition from a Hive Metastore and HDFS location (managed table). You can also manually update or drop a Hive partition directly on HDFS using Hadoop commands, if you do so you need to run theMSCKcommand to synch up HDFS files with Hiv...
output will look similar to this 9316 SecondaryNameNode 9203 DataNode 9521 TaskTracker 9403 JobTracker 9089 NameNode Now we have all the daemons running: Note: If your master server fails to start due to the dfs safe mode issue, execute this on the Hadoop command line: ...
at org.apache.spark.sql.execution.QueryExecution$$anonfun$eagerlyExecuteCommands$1.$anonfun$applyOrElse$1(QueryExecution.scala:111) at org.apache.spark.sql.execution.SQLExecution$.$anonfun$withNewExecutionId$5(SQLExecution.scala:103) at org.apache.spark.sql.execution.SQLExecution$.withSQ...
9.Finally, configure ssh key based authentication forhadoopaccount by running the below commands (replace thehostnameorFQDNagainst thessh-copy-idcommand accordingly). Also, leave thepassphrasefiled blank in order to automatically login via ssh. ...