HDFS has master/slave architecture. An HDFS cluster consists of a single NameNode, a master server that manages the file system namespace and regulates access to files by clients.
In addition, there are a number of DataNodes, usually one per node in the cluster, which manage storage attached to the nodes that they run on.
The NameNode and DataNode are pieces of software designed to run on commodity machines.
NameNode periodically receives a Heartbeat and a Block report from each of the DataNodes in the cluster. Receipt of a Heartbeat implies that the DataNode is functioning properly.
A Blockreport contains a list of all blocks on a DataNode. When NameNode notices that it has not received a heartbeat message from a data node after a certain amount of time, the data node is marked as dead. Since blocks will be under replicated the system begins replicating the blocks that were stored on the dead DataNode.
The NameNode Orchestrates the replication of data blocks from one DataNode to another. The replication data transfer happens directly between DataNode and the data never passes through the NameNode.
Managing a business data is not an easy thing, it is very complex process to handle the corporate information both Hadoop and cognos doing this in a easy manner with help of business software suite, thanks for sharing this useful post….
ReplyDeleteRegards,
cognos Training in Chennai|cognos Training Chennai|cognos Training
Maharashtra Police Patil Recruitment 2016
ReplyDeleteThanks for sharing it. I found this Information very interesting and informative Keep sharing.......
Great blog.
ReplyDeleteThank you so much.
hadoop online training in india
hadoop online training in chennai
hadoop online training in hyderabad
I simply wanted to write down a quick word to say thanks to you for those wonderful tips and hints you are showing on this site.
ReplyDeleteBest Java Training Institute Chennai
Amazon Web Services Training in Chennai
You’ve written a really great article here. Your writing style makes this material easy to understand.. I agree with some of the many points you have made. Thank you for this is real thought-provoking content
ReplyDeletepython training in chennai | python training in bangalore
python online training | python training in pune
python training in chennai | python training in bangalore
python training in tambaram | python training in velachery
Awesome article. It is so detailed and well formatted that i enjoyed reading it as well as get some new information too.
ReplyDeletejava training in omr
java training in annanagar | java training in chennai
java training in marathahalli | java training in btm layout
java training in rajaji nagar | java training in jayanagar
I am definitely enjoying your website. You definitely have some great insight and great stories.
ReplyDeleteData Science training in marathahalli
Data Science training in btm
Data Science training in rajaji nagar
Data Science training in chennai
Data Science training in kalyan nagar
Data Science training in electronic city
Data Science training in USA
This is most informative and also this post most user friendly and super navigation to all posts... Thank you so much for giving this information to me..
ReplyDeletepython online training
python training in OMR
python training institute in chennai
nice article... lot of information... thank you for sharing the info for any online training like micro dynamics crm training online Microsoft Dynamics CRM Training Online and many other step to this.
ReplyDeleteI wondered upon your blog and wanted to say that I have really enjoyed reading your blog posts. Any way I’ll be subscribing to your feed and I hope you post again soon.
ReplyDeleteGerman Classes in Chennai
Java Training in Chennai
German language training in chennai
German Training in Chennai
Java course in Chennai
Java Training Institute in Chennai
Needed to compose you a very little word to thank you yet again regarding the nice suggestions you’ve contributed here.
ReplyDeleteData Science training in kalyan nagar | Data Science training in OMR | Data science training in chennai
Data Science training in chennai | Best Data science Training in Chennai | Data science training in velachery | Data Science Training in Chennai
Data science training in tambaram | Data Science training in Chennai | Data science training in jaya nagar | Data science Training in Bangalore
Thanks for the informative article. This is one of the best resources I have found in quite some time. Nicely written and great info. I really cannot thank you enough for sharing.
ReplyDeleteJava training in Bangalore | Java training in Marathahalli | Java training in Bangalore | Java training in Btm layout
Java training in Bangalore | Java training in Jaya nagar | Java training in Bangalore | Java training in Electronic city
I would assume that we use more than the eyes to gauge a person's feelings. Mouth. Body language. Even voice. You could at least have given us a face in this test.
ReplyDeleteData Science Training in Indira nagar
Data Science training in marathahalli
Data Science Interview questions and answers
Thank you a lot for providing individuals with a very spectacular possibility to read critical reviews from this site.
ReplyDeletepython course institute in bangalore | python Course institute in bangalore| python course institute in bangalore
I’ve got some recommendations for your blog you might be interested in hearing.\
ReplyDeletefire and safety course in chennai
Hmm, it seems like your site ate my first comment (it was extremely long) so I guess I’ll just sum it up what I had written and say, I’m thoroughly enjoying your blog. I as well as an aspiring blog writer, but I’m still new to the whole thing. Do you have any recommendations for newbie blog writers? I’d appreciate it.
ReplyDeleteAWS Training in Bangalore | Amazon Web Services Training in bangalore , india
AWS Training in pune | Amazon Web Services Training in Pune, india
AWS Training in Chennai|Amazon Web Services Training in Chennai,India
aws online training and certification | amazon web services online training ,india
Your very own commitment to getting the message throughout came to be rather powerful and have consistently enabled employees just like me to arrive at their desired goals.
ReplyDeleteaws Training in indira nagar | Aws course in indira Nagar
selenium Training in indira nagar | Best selenium course in indira Nagar | selenium course in indira Nagar
python Training in indira nagar | Best python training in indira Nagar
datascience Training in indira nagar | Data science course in indira Nagar
devops Training in indira nagar | Best devops course in indira Nagar
Impressive Post!
ReplyDeleteJava Training in Chennai
Python Training in Chennai
IOT Training in Chennai
Selenium Training in Chennai
Data Science Training in Chennai
FSD Training in Chennai
MEAN Stack Training in Chennai
You made such an interesting piece to read, giving every subject enlightenment for us to gain knowledge. Thanks for sharing the such information with us
ReplyDeletedevops online training
aws online training
data science with python online training
data science online training
rpa online training
After seeing your article I want to say that the presentation is very good and also a well-written article with some very good information which is very useful for the readers....thanks for sharing it and do share more posts like this.
ReplyDeleteMicrosoft Azure online training
Selenium online training
Java online training
uipath online training
Python online training
ReplyDeleteHey, would you mind if I share your blog with my twitter group? There’s a lot of folks that I think would enjoy your content. Please let me know. Thank you.
AWS Training in Chennai | Best AWS Training in Chennai | AWS Training Course in Chennai
Data Science Training in Chennai | Best Data Science Training in Chennai | Data Science Course in Chennai
No.1 Python Training in Chennai | Best Python Training in Chennai | Python Course in Chennai
RPA Training in Chennai | Best RPA Training in Chennai
Web Designing Training in Chennai | Best Web Designing Training in Chennai
ReplyDeleteHey, would you mind if I share your blog with my twitter group? There’s a lot of folks that I think would enjoy your content. Please let me know. Thank you.
AWS Training in Chennai | Best AWS Training in Chennai | AWS Training Course in Chennai
Data Science Training in Chennai | Best Data Science Training in Chennai | Data Science Course in Chennai
No.1 Python Training in Chennai | Best Python Training in Chennai | Python Course in Chennai
RPA Training in Chennai | Best RPA Training in Chennai
Web Designing Training in Chennai | Best Web Designing Training in Chennai
Your very own commitment to getting the message throughout came to be rather powerful and have consistently enabled employees just like me to arrive at their desired goals.
ReplyDeleteData science Course Training in Chennai | Data Science Training in Chennai
RPA Course Training in Chennai | RPA Training in Chennai
AWS Course Training in Chennai | AWS Training in Chennai
Telugu Love Stories
ReplyDeleteAppreciated for This Good Work...I am very Happy to visit your site,incredibly generous Comments...Thanks
ReplyDeleteJava training in chennai | Java training in annanagar | Java training in omr | Java training in porur | Java training in tambaram | Java training in velachery
Thanks for sharing such informative guide on .Net technology. This post gives me detailed information about the .net technology. I am working as trainer in leading IT training academy offering Dot Net Training in Chennai and i use your guide to educate my students.
ReplyDeleteDot Net Training in Chennai | Dot Net Training in anna nagar | Dot Net Training in omr | Dot Net Training in porur | Dot Net Training in tambaram | Dot Net Training in velachery
I learned how to hadoop handled failure of name node..really awesome thanks for sharing your information..keep to sharing....
ReplyDeleteAndroid Training Institute in Chennai | Certification | Online Course Training | Android Training Institute in Bangalore | Certification | Online Course Training | Android Training Institute in Hyderabad | Certification | Online Course Training | Android Training Institute in Coimbatore | Certification | Online Course Training | Android Training Institute in Online | Certification | Online Course Training
If AWS is a job that you're dreaming of, then we, Infycle are with you to make your dream into reality. Infycle Technologies offers the best AWS Course Chennai, with various levels of highly demanded software courses such as Oracle, Java, Python, Hadoop, Big Data, etc., in 100% hands-on practical training with specialized tutors in the field. Along with that, the pre-interviews will be given for the candidates, so that, they can face the interviews with complete knowledge. To know more, dial 7502633633 for more.Learn AWS Course in Chennai | Infycle Technologies
ReplyDelete