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
Related
I had a Hadoop on my machine running but I was running into some compiler issues, so I deleted it and started fresh.
I was following this setup: https://www.guru99.com/how-to-install-hadoop.html
When I run $HADOOP_HOME/bin/hdfs namenode -format
Terminal doesn't return any thing.
Thanks in advance.
I had the same issue and fix it by following
Change to etc file for adjusting the files hadoop-env , core-site, mapred, yarn
Change to sbin to do format and lunch hds services
run with sudo will get you result
for example
sudo hdfs namenode -format
You need to make sure that you already adjust the files hadoop-env , core-site, mapred, yarn then processed to namenode format
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
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
I'm struggling with installing Hadoop 2.2.0 on my Mac OSX 10.9.3. I essentially followed this tutorial:
http://www.alexjf.net/blog/distributed-systems/hadoop-yarn-installation-definitive-guide
When I run $HADOOP_PREFIX/bin/hdfs namenode -format to format namenode, I get the message:
SHUTDOWN_MSG: Shutting down NameNode at Macintosh.local/192.168.0.103. I believe this is preventing me from successfully running the test
$HADOOP_PREFIX/bin/hadoop jar $HADOOP_PREFIX/share/hadoop/yarn/hadoop-yarn-applications-
distributedshell-2.2.0.jar org.apache.hadoop.yarn.applications.distributedshell.Client --jar
$HADOOP_PREFIX/share/hadoop/yarn/hadoop-yarn-applications-distributedshell-2.2.0.jar --
shell_command date --num_containers 2 --master_memory 1024
Does anyone know how to correctly format namenode?
(Regarding the test command above, someone mentioned to me that it could have something to do with the hdfs file system not functioning properly, if this is relevant.)
The NameNode does not start after stop-all.sh with start-all.sh. I try hadoop namenode -format and hadoop-daemon.sh start namenode then everything ok. However my data is lost in HDFS.
I do not want data loss. This result, hadoop namenode -format command is not want my path to a solution. How can I start the NameNode with start-all.sh ?
Thanks
First of all, stop-all.sh with start-all.sh are deprecated. Use start-dfs.sh and start-yarn.sh instead of start-all.sh. Same with stop-all.sh(it already says so)
secondly, hadoop namenode -format formats your HDFS and should therefore be used only once, at the time of installation.
Hadoop by default sets the property of hadoop.tmp.dir to a directory in /tmp, where the files are deleted after every restart. Set the hadoop.tmp.dir property in $HADOOP_HOME/conf/hadoop/core-site.xml, to some place where the files are not usually deleted. Run the hadoop namenode -format (actually it is hdfs namenode -format, this one is also deprecated.) one last time and start the daemons.
PS: If you can post the log file or the terminal screenshot of the error, it will be easier to help you.
hadoop.temp.dir
temp = should be "tmp" => hadoop.tmp.dir
I missed only "e".