I have established a single node hadoop cluster on Cent OS 7. It is successfully installed and all the daemons are up.
My challenge is when I go to web interface like ***IP_Address:50070*** it is not showing up anything. Please suggest how do I resolve it.
Things I tried:
Reconfigured properties, formatted HDFS and restarted all the daemons.
Please suggest. Thanks!
Related
I just installed Hortonwroks Sandbox via virtualbox. And when i started Ambari every services was red like you can see in this screenshot . Have i missed something? i'm a beginner in hadoop
Actually, when we start HDP Sandbox all Services services go into the starting stage except Strome, Atlas, Hbase (This can be checked by Gear Icon on the top right side from there you can check the reason behind of failed Services).
Try to Manually Start services in the following manner
Zookeeper
HDFS
YARN
MapReduce
Hive
I set-up a new Hadoop Cluster with Hortonworks Data Platform 2.5. In the "old" cluster (installed HDP 2.4) I was able to see the information about running Spark jobs via the History Server UI by clicking the link show incomplete applications:
Within the new installation this link opens the page, but it always sais No incomplete applications found! (when there's still an application running).
I just saw, that the YARN ResourceManager UI shows two different kind of links in the "Tracking UI" column, dependent on the status of the Spark application:
application running: Application Master
this link opens http://master_url:8088/proxy/application_1480327991583_0010/
application finished: History
this link opens http://master_url:18080/history/application_1480327991583_0009/jobs/
Via the YARN RM link I can see the running Spark app infos, but why can't I access them via Spark History Server UI? Was there somethings changed from HDP 2.4 to 2.5?
I solved it, it was a network problem: Some of the cluster hosts (Spark slaves) couldn't reach each other due to a incorrect switch configuration. Found it out, as I tried to ping each host from each other.
Since all hosts can ping each other hosts the problem is gone and I can see active and finished jobs in my Spark History server UI again!
I didn't noticed the problem, because the ambari-agents worked on each host, and the ambari-server was also reachable from each cluster host! However, since ALL hosts can reach each other the problem is solved!
I am student and doing computer science. As a part of my research i am working on the hadoop environment. The person who was working on this research before me has configured 9 Datanode with a namenode and a stand by node. we have our network traffic data stored in the hive and i am developing hive queries to identify network attack. The person who was working on this already left from our place and working somewhere else and busy with job. so i have couple of questions :
1) how can I understand the architecture on HDFS of my environment i.e how the machines are connected to build this environment. Also what services for this environment installed on which machines?
2) Now we have 9 datanodes in the environement and my professor wants to reduce the datanodes. her goal is to do the research with 2-3 (minimal) machine in this environment.
3) What are the good and easy source to get understanding about the cloudera and hadoop ? Also the commands which can be used to explicitly start and stop a service.
4) Right now in cloudera manager I am not able to start the Namenode server, Secondary datanode and one more. I stop all the services in order from cloudera and now starting in order and in that order the HDFS service comes first so while starting it, it gives the failure message for namenode datanode and datanode8.
I tried several ways but no luck. Please suggest me some ways I can solve issues and good resource(for beginner), I can refer to dig into this more.
Thanks.
There are several resources to start. For everything Cloudera/CDH, the place to go is Cloudera Documentation. For Hadoop, the place to go is Hadoop Documentation. Now, I reckon, this is a rather big bite to chew. If you're new to Hadoop, better start with a book, some introduction (I can't recommend one since I haven't read any).
For your specific problem, it seems that the some services don't start. You need to look at the services' logs, on the respective nodes. I can't tell you where those logs are, because it depends on the your distribution version and on how it was configured. I suspect one vital service does not start (probably HDFS, looks like namenode is down) and this causes every other service to fail. Hadoop Wiki has a troubsleshooting guide, try to follow that and see if it helps you.
As for the question on how to adjust the cluster size, first get it up and running and then consider changing it. Refer to Decommissioning and Recommissioning Hosts.
I have installed Hadoop 2.7.1 in psuedo distributed mode (all daemons on single machine). It's up and running and I'm able to access HDFS through command line and run the jobs and I'm able to see the output.
I can access http://localhost:50070/dfshealth.html#tab-overview. it shows version and cluster status and can access hadoop file system.
I found one link and applied its accepted solution but that does not work for me. When I am trying to access http://127.0.0.1:54310, I am getting below error message
It looks like you are making an HTTP request to a Hadoop IPC port. This is
not the correct port for the web interface on this daemon.
Any help is appreciated.
Thanks..
I am using MR2 and not able to track my job on 8088. When I run map reduce job, it submit the job on http://localhost:8080 and thats url is not opening to track the job.
Use port 50030 if you are using MRV1 for YARN use port 8088 for accessing resource manager.
Hi i have a small doubt , I have started to use in my curiosity but now i have the following problem
My scenario is like this - i have 10 machines connected in LAN and i need to create Name Node in one system and Data Nodes in remaining 9 machines . So do i need to install Hadoop on all the 10 machines ?
For example i have ( 1.. 10 ) machines , where machine1 is Server and from machine(2..9) are slaves[Data Nodes] so do i need to install hadoop on all 10 machines ?
And i have searched a lot On Hadoop cluster network on commodity machine but i dint get any thing related to Installation [ that is configuration]. Some of them given like how to config and install Hadoop on own system but not on the clustered environment
Can any one help me ? and give me the detailed idea or article suggested links to do the above process
Thanks
Yes, you need Hadoop installed in every node and each node should have the services started as for appropriate for its role. Also the configuration files, present on each node, have to coherently describe the topology of the cluster, including location/name/port for various common used resources (eg. namenode). Doing this manually, from scratch, is error prone, specially if you never did this before and you don't know exactly what you're trying to do. Also would be good to decide on a specific distribution of Hadoop (HortonWorks, Cloudera, HDInsight, Intel, etc)
I would recommend use one of the many deployment solutions out there. My favorite is Puppet, but I'm sure Chef will do too.
A different (perhaps better?) alternative is to use Ambari, which is a Hadoop specialized deployment and administering solution. See Deploying and Managing Hadoop Clusters with AMBARI.
Some Puppet resources to get you started: Using Vagrant, Puppet, Testing & Hadoop
Please verify below tutorial
http://www.michael-noll.com/tutorials/running-hadoop-on-ubuntu-linux-multi-node-cluster/
Hope it helps
Yes hadoop needs to be there on all the computers
For clustered Environment please go through the video