You can stop the NameNode individually using /sbin/hadoop-daemon.sh stop namenode command. Then start the NameNode using /sbin/hadoop-daemon.sh start namenode. Use /sbin/stop-all.sh and the use /sbin/start-all.sh, command which will stop all the demons first. Then ...
1- Stop Hadoop Services Stopping the Hadoop services makes sure no processes are active during the uninstallation, which could result in data corruption or other system challenges. Hadoop makes use of several services, including NameNode (for managing file system information) and DataNode (for data...
For instance; if the user is going to configure NameNode for using the parallelGC, the statement in the hadoop-end.sh would be as follows. Export HADOOP_NAMENODE OPT=”-xx:+UseParallelGC” Monitoring Health of NodeManagers- This helps the administrators to determine whether the node is ...
In case of any issue observed for getting the connection to Hadoop NameNode, the below command can be used to verify the Hadoop metrics in which the Connector will extract the State in active as a valid connection, curl <HDFS_URL>/jmx?qry=Hadoop:service=NameNode,name=NameNodeStatus A samp...
Intellipaatis the user name I have used. You can change it according to your user name. Hadoopis the location where I want to save this file. You can change it as well if you want. Step 12:Editing and Setting up HadoopFirst, you need to set the path in the~/.bashrcfile. You can...
192.168.1.41 master.hadoop.lan Set Hostname in /etc/hosts File Replace the above hostname and FQDN records with your own settings. 2.Next, go toOracle Java downloadpage and grab the latest version ofJava SE Development Kit 8on your system with the help ofcurlcommand: ...
View the node-master public key and copy it to your clipboard to use with each of your worker nodes. less /home/hadoop/.ssh/id_rsa.pub In each Linode, make a new file master.pub in the /home/hadoop/.ssh directory. Paste your public key into this file and save your changes. Copy...
For handling the slowness in decommissioning process, We at Clairvoyant did the below steps: 1. Recommissioned the DataNode back to the cluster. 2. Updated the below-tuning configs to the custom hdfs-site.xml dfs.namenode.replication.max-streams = 50 ...
Hadoop-1.1.2 (Any stable release) Follow these steps for installing and configuring Hadoop on a single node: Step-1. Install Java In this tutorial, we will use Java 1.6 therefore describing the installation of Java 1.6 in detail. Use the below command to begin the installation of Java ...
First you would need to stop all the Hadoop processes in your Namenode. This can be done by running the default stop-all script which will also stop DFS: On Linux - bin/stop-all.sh On Windows – C:\apps\dist\bin\StopHadoop.cmd Now you would need to delete all files in your main...