I have installed hadoop 2.7.3 in my ubuntu 16.10. I want to create a multinode cluster and I have done all the steps till formatting the namenode but "hadoop-daemon.sh start namenode command is not working. When I type this command it shows" hadoop-daemon.sh: command not found.
You need to execute following command. sbin/start-dfs.sh or sbin/start-yarn.sh
Related
Functionally, I was wondering whether there is a difference between starting a hadoop namenode with the command:
$HADOOP_HOME/sbin/hadoop-daemons.sh --config $HADOOP_CONF_DIR --script hdfs start datanode
and:
hdfs datanode
The first command gives me an error stating that the datanode cannot ssh into itself(this is running on a docker container), while the second command seems to run without that issue. The official hadoop documentation for this version, (2.9.1) doesn't mention "hdfs datanode" as a way to start a datanode.
I have successfully installed Hadoop in my ubuntu system.
But when i run the command start-all.sh all the daemons start except the namenode.
Please help me.I Have attached the image with the problem
Try to Name Node Format Format it might work for You:
bin/hadoop namenode -format
and then try
start-all.sh
Job tracker and Task tracker don't sow up when ran the start-all.sh command in ububtu for hadoop
I do get the rest of the processes while i run the "JPS" command in unix.
Not sure why i am not being shown with the job tracker and task tracker.Have been following couple of links and couldn't get my prob sorted.
Steps done :
-Multiple times formatted the namenode
-Multiple time deleted and recreated the tmp folder with appropriate permissions.
What could be the issue ?
Any suggestions would really help me as i am struggling in setting up hadoop on my laptop.I am new to it though.
Try starting jobtracker and tasktracker separately.
From your hadoop HOME directory run
. bin/../libexec/hadoop-config.sh
Then from hadoop BIN directory run
hadoop-daemon.sh --config $HADOOP_CONF_DIR start jobtracker
hadoop-daemon.sh --config $HADOOP_CONF_DIR start tasktracker
You must have been using hadoop 2.x version where jobtracker is replaced with YARN resource manager. Using jps(jdk is needed) you can check whether resouce manager is running. If it is running then the default url for it is (host-name):8088. You can check your nodes,jobs also configuration there.If not running then start them with sbin/start-yarn.sh.
I would like to see if the hdfs file system for Hadoop is working properly. I know that jps lists the daemons that are running, but I don't actually know which daemons to look for.
I ran the following commands:
$HADOOP_PREFIX/sbin/hadoop-daemon.sh start namenode
$HADOOP_PREFIX/sbin/hadoop-daemon.sh start datanode
$HADOOP_PREFIX/sbin/yarn-daemon.sh start resourcemanager
$HADOOP_PREFIX/sbin/yarn-daemon.sh start nodemanager
Only namenode, resourcemanager, and nodemanager appeared when I entered jps.
Which daemons are supposed to be running in order for hdfs/Hadoop to function? Also, what could you do to fix hdfs if it is not running?
Use any of the following approaches for to check your deamons status
JPS command would list all active deamons
the below is the most appropriate
hadoop dfsadmin -report
This would list down details of datanodes which is basically in a sense your HDFS
cat any file available in hdfs path.
So, I spent two weeks validating my setup (it was fine) , finally found this command:
sudo -u hdfs jps
Initially my simple JPS command was showing only one process, but Hadoop 2.6 under Ubuntu LTS 14.04 was up. I was using 'Sudo' to run the startup scripts.
Here is the startup that work with JPS listing multiple processes:
sudo su hduser
/usr/local/hadoop/sbin/start-dfs.sh
/usr/local/hadoop/sbin/start-yarn.sh
How to start / Stop services from command line CDH4 --. I am new to Hadoop. Installed VM from Cloudera. Could not find start-all.sh and stop-all.sh . How to stop or start the task tracker or data node if I want. It is a single node cluster which I am using on Centos. I haven't dont any modifications.
More over I see there are changes in the directory structures in all flavours. I could not locate these sh files on the VM for my installation.
[cloudera#localhost ~]$ stop-all.sh
bash: stop-all.sh: command not found
Highly appreciate your support.
use Sudo su hdfs to start and to stop just type exit it will stop all the services.