Cannot start cluster from namenode (master): different $HADOOP_HOME on datanode (slave) and namenode (master)
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I am using Hadoop 1.2.1 on master and slave but I have them installed on different directories. So when I invoke
bin/start-dfs.sh on master, I get the following error.
partho@partho-Satellite-L650: starting datanode, logging to /home/partho/hadoop/apache/hadoop-1.2.1/libexec/../logs/hadoop-partho-datanode-partho-Satellite-L650.out hduser@node2-VirtualBox: bash: line 0: **cd: /home/partho/hadoop/apache/hadoop-1.2.1/libexec/..: No such file or directory** hduser@node2-VirtualBox: bash: **/home/partho/hadoop/apache/hadoop-1.2.1/bin/hadoop-daemon.sh: No such file or directory** partho@partho-Satellite-L650: starting secondarynamenode, logging to /home/partho/hadoop/apache/hadoop-1.2.1/libexec/../logs/hadoop-partho-secondarynamenode-partho-Satellite-L650.out
The daemons are getting created fine on the Master as you can see below
partho@partho-Satellite-L650:~/hadoop/apache/hadoop-1.2.1$ jps 4850 Jps 4596 DataNode 4441 NameNode 4764 SecondaryNameNode
It is obvious that Hadoop is trying to find the
libexec on the slave using the
$HADOOP_HOME on the master.
How can I configure individual datanodes/slaves so that when I start a cluster from master, the Hadoop home directory for the respective slaves are checked for
Hadoop usually sets the HADOOP_HOME environment variable on each node in a file named hadoop-env.sh.
You can update hadoop-env.sh on each node with the path for the respective node. It should maybe be in /home/partho/hadoop/apache/hadoop-1.2.1/. Probably want to stop the cluster first so it will pickup the changes.
If you have locate installed run locate hadoop-env.sh or find / -name "hadoop-env.sh"
Cannot start cluster from namenode (master): different - iOS, Cannot start cluster from namenode (master): different $HADOOP_HOME on datanodes/slaves so that when I start a cluster from master, the Hadoop home To start HDFS, just run start-dfs.sh on master-side. The slave-side data node will be started as if hadoop-daemon.sh start datanode is executed from an interactive shell on slave-side. To stop HDFS, just run stop-dfs.sh.
For Best solution for this you should keep hadoop directory in your any directory but it should be same for both like Example:
on master path:
Hadoop: Error: Hadoop Master cannot start the Slave with different , Hadoop: Error: Hadoop Master cannot start the Slave with different Hadoop multi-node cluster with different user for Master and Slave. Your name to display (optional): Hadoop framework does not require ssh and that the DataNode and failed to start the Namenode format in hadoop generation 2. Issuing it on the master machine will start/stop the daemons on all the nodes of a cluster. 2- start.dfs.sh, stop.dfs.sh and start-yarn.sh, stop-yarn.sh: Same as above but start/stop HDFS and YARN daemons separately from the master machine on all the nodes. It is advisable to use these commands now over start-all.sh & stop-all.sh. 3- hadoop
Once you set up the cluster, to start all daemons from master
bin/hadoop namenode -format(if required) bin/stop-dfs.sh bin/start-dfs.sh bin/start-mapred.sh
In order to start all nodes from master,
- you need to install ssh on each node - once you install ssh and generate ssh key in each server, try connecting each nodes from master - make sure slaves file in master node has all Ips of all nodes
So commands would be
- install ssh(in each node) : apt-get install openssh-server - once ssh is installed,generate key : ssh-keygen -t rsa -P "" - Create password less login from namenode to each node: ssh-copy-id -i $HOME/.ssh/id_rsa.pub user@datanodeIP user - hadoop user on each machine`enter code here` - put all nodes ip in slaves(in conf dir) file in namenode
Apache Hadoop 3.2.0 – Hadoop Cluster Setup, Monitoring Health of NodeManagers; Slaves File; Hadoop Rack Typically one machine in the cluster is designated as the NameNode and another These are the masters. Other services (such as Web App Proxy Server and MapReduce Job [hdfs]$ $HADOOP_HOME/bin/hdfs --daemon start datanode. To configure the Hadoop cluster you will need to configure the environment in which the Hadoop daemons execute as well as the configuration parameters for the Hadoop daemons. HDFS daemons are NameNode, SecondaryNameNode, and DataNode. YARN daemons are ResourceManager, NodeManager, and WebAppProxy.
HADOOP INSTALLATION, Before we start, we will understand the meaning of the following: DataNode:¶. A DataNode stores data in the Hadoop File System. A functional file system The NameNode is the centrepiece of an HDFS file system. It keeps the directory of Here we are creating a cluster of 2 machines , one is master and other is slave 1. Hadoop: Slave nodes are not starting. I am trying to setup a Pseudo Distributed Hadoop Cluster on my machine. Vm's Created one master and one slave. But when i tried to add the slave, the datanode, jobtracker, namenode and secondary namenode starts fine in the Master but no data node starts in the slave.
Hadoop cluster setup, Slave nodes store the actual data and provide processing power to run the jobs. The master node will use an ssh-connection to connect to other nodes with key-pair This section will walk through starting HDFS on NameNode and DataNodes, and You should get on node-master (PID will be different):. The main difference between NameNode and DataNode in Hadoop is that the NameNode is the master node in Hadoop Distributed File System that manages the file system metadata while the DataNode is a slave node in Hadoop distributed file system that stores the actual data as instructed by the NameNode.
How To Spin Up a Hadoop Cluster with DigitalOcean Droplets, This tutorial will cover setting up a Hadoop cluster on DigitalOcean. of common utilities and libraries necessary to support other Hadoop modules. scripts (be sure to check scripts before running by using the less command):. sudo . Starting datanodes Starting secondary namenodes [hadoop-master]. RegionServer: Stores data for the HBase system. In Hadoop 2, HBase uses Hoya, which enables RegionServer instances to be run in containers. Here, each slave node is always running a DataNode instance (which enables HDFS to store and retrieve data blocks on the slave node) and a NodeManager instance (which enables the Resource Manager to assign application tasks to the slave node for processing).
HDFS Data nodes from slaves can't connect to the name node #206, In order to access to the hdfs i was need to start data nodes (cd stop datanode) But after i am starting datanodes on all instances (both master and sl. hostname=188.8.131.52): DatanodeRegistration(0.0.0.0:50010, of my instances; recreated cluster with 3 slaves, no datanodes connected to name node. A2A. NameNode can be considered as a master of the system. It maintains the file system tree and the metadata for all the files and directories present in the system.
- The version should matter. Hadoop3 properties wouldn't work on Hadoop 2 or 1
- why not it's work fine if you having hadoop3 on master and hadoop2 on slave but directory name should as hadoop only on both it will take data from master and search same configuration file on slave.
- Directory names and locations are not important. The protocol used by the clients talking to the master and the properties that they read from the files matter.
- For example, if you had a property file with YARN Docker containers enabled and Erasure Coding HDFS settings, that'll only work on Hadoop3, not anything less
- APIs are supported by hadoop in hadoop 3 ,2, 1 are compatible