I am newbie to Hadoop. I tried to do single node cluster set up and while opening Resource manager UI and job history UI, I am getting server not found error.
Please refer the attached image. While executing jps command, I am seeing following O/P:
5023 JobHistoryServer
5554 Jps
4631 ResourceManager
3916 DataNode
4014 NameNode
4124 SecondaryNameNode
4888 NodeManager
I am seeing server not found on these UIs: http://localhost:8088/cluster and http://localhost:19888/jobhistory.
Please assist on how to access these UIs.
Thank you all, for your replies,i am able to access the UIs now.Page was displaying server not found,so i tried to check hostname on box and replaced localhost with hostname/ipaddress,finally able to access both the UIs now.
screenshot
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I have Hadoop-3.1.3 and I can upload a file in hadoop pseudo distributed mode, also can display the contents of file.
but when I call jps command i am getting the following output
10912 DataNode
13072 ResourceManager
4480 NodeManager
6584 Jps
664 Namenode
I am unable to find secondary name node, is there a problem with any configuration or hadoop installation?
You're assuming that secondary namenode is started with psuedo-distributed?
If the basic commands work, then its fine.
You need to look at log files to know if something is broken, before asking elsewhere....
In general, I always suggest you use Apache Ambari to provision a Hadoop cluster
You can start the Secondary NameNode manually and observe the start up logs to see if there's anything wrong:
hdfs secondarynamenode
If there's no error, run jps again and hopefully you see SecondaryNameNode listed.
I'd suggest running hdfs --help and checking out all of the options, there's a lot of good stuff there.
Introduction: I'm using Ubuntu 18.04.2 LTS on which I'm trying to set up a Hadoop 3.2 Single Node Cluster. The installation goes perfectly fine, and I have Java installed. JPS is working as well.
Issue: I'm trying to connect to the Web GUI at localhost:50070, but I'm unable to. I'm attaching a snippet of my console when I execute ./start-all.sh:
root#it-research:/usr/local/hadoop/sbin# ./start-all.sh
Starting namenodes on [localhost]
Starting datanodes
Starting secondary namenodes [it-research]
Starting resourcemanager
Starting nodemanagers
pdsh#it-research: localhost: ssh exited with exit code 1
root#it-research:/usr/local/hadoop/sbin# jps
6032 Jps
3154 SecondaryNameNode
2596 NameNode
I'm unable to resolve localhost: ssh exited with exit code 1
Solutions I've tried:
Set up password-less SSH
Set up NameNode User
Set up PDSH to work with SSH
I've also added master [myIPAddressv4Here] in /etc/hosts file and tried connecting to master:50070. but still facing the same issue
Expected Behaviour: I should be able to connect to the Web GUI when I go to localhost:50070, but I can't.
Please let me know if there's some more information I should provide.
The port number for Hadoop 3.x is 9870, so localhost:9870 should work.
I am trying to set of a multi-node hadoop cluster using Hadoop 3.0.0. There is no straightforward documentation on this so I had to read a lot of blogs. I am at a point where when I run start-all.sh I see daemon processes appearing in the name node as well as data nodes. However, when I go to http://namenode:9870 I see 0 live nodes.
To be more specific when I run start-all.sh I see
and I when I run jps I see NameNode, SecondaryNameNode and ResourceManager processes are running. On data nodes running jps shows DataNode and NodeManager are running.
What I get on the url is
Any guidance is greatly appreciated.
Thanks
I installed the hadoop 2.2 system on my ubuntu box using this tutorial
http://codesfusion.blogspot.com/2013/11/hadoop-2x-core-hdfs-and-yarn-components.html
Everything worked fine for me and now when I do
http://localhost:50070
I can see the management UI for HDFS. Very good!!
But the I am going through another tutorial which tells me that there must be a task manager UI running at http://mymachine.com:50030 and http://mymachine.com:50060
on my machine I cannot open these ports.
I have already done
start-dfs.sh
start-yarn.sh
start-all.sh
is something wrong? why can't I see the task manager UI?
You have installed YARN (MRv2) which runs the ResourceManager. The URL http://mymachine.com:50030 is the web address for the JobTracker daemon that comes with MRv1 and hence you are not able to see it.
To see the ResourceManager UI, check your yarn-site.xml file for the following property:
yarn.resourcemanager.webapp.address
By default, it should point to : resource_manager_hostname:8088
Assuming your ResourceManager runs on mymachine, you should see the ResourceManager UI at http://mymachine.com:8088/
Make sure all your deamons are up and running before you visit the URL for the ResourceManager.
For Hadoop 2[aka YARN/MRV2] - Any hadoop installation version-ed 2.x or higher its at port number 8088. eg. localhost:8088
For Hadoop 1 - Any hadoop installation version-ed lower than 2.x[eg 1.x or 0.x] its at port number 50030. eg localhost:50030
By default HadoopUI location is as below
http://mymachine.com:50070
I have installed CDH3U5 on a 2 node cluster. Everything seems to run fine such as all the services, web UI, MR jobs, HDFS shell commands. However, interestingly, when I started the datanode service, it gave me an OK message that datanode is running as process say X. But when I run JPS, I do not see the label "Datanode" for the process. So the output looks like -
17153 TaskTracker
18908 Jps
16267
The process ID - 16267 is the Datanode process. All other checkpoints have passed. So this seems weird. The same thing happens on the other node in the cluster. Any insight into this behavior and if this is something that needs fixing would be helpful.
can you check the following and reply?
- web interface for namenode and what does it show there for livenode
- logfiles for datanode to see if any exception
- if datanode is pingable/ssh from namenode and viceversa
If all the above look ok I'm not sure what the problem is but to fix you can
- stop all hadoop deamons
- delete temp directory pointed in conf/core-site.xml for both NN and DN
- format namenode
- start deamon