Hadoop Tutorial - High Availability, Fault Tolerance & Secondary Name Node

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[@ScholarNest]

Want to learn more Big Data Technology courses. You can get lifetime access to our courses on the Udemy platform. Visit the below link for Discounts and Coupon Code. www.learningjournal.guru/courses/

[@mdshahalam3010]

Nothing is tough when you have a good teacher. Kudos for your work sir.

[@mathisinav4267]

No one, i repeat no one has explained hadoop with this perfection. A million thanks

[@iwonazwierzynska4056]

The best explanation of standby node in the Internet!!

[@Van-pf2or]

Crisp, Simple and Picture is what called as best teaching. You are a best tutor.

[@labyrinth1991]

I have gone through so many tutorials but the way you explained sir makes it so easy to understand hadoop. Thanks a lot sir!!

[@prannoyroy5312]

I have become a fan of your style of teaching. Thank you, sir. 😊

[@moehijawe555]

Really thank you for such topics,I spent a lot of time reading books but I couldn't understand anything till I watched your tutorials. big thanks

[@vinitsunita]

As you described, the role of Secondary Name Node is to regularly take the checkpoint at configured interval and update the on disc FS Image by applying the editlogs that were captured in the time window when it took last checkpoint. And to further reduce the restart time of Primary Name Node, it does the same checkpoint process where it reads the on disc FS Image stored by SNN and apply the editlogs entry to create latest FS Image and store it in memory. Few questions wrt these : - 1. Where does SNN stores the FS Image. Is it inside disc on local file system ? 2. How does primary name node get access to that Secondary NN ?

[@rjlifeandtech8675]

1. zookeeper election 2. split-brain concepts 3. Hadoop 3, erasure coding and storage policies Could you please explain all above

[@arjunpandey1617]

You make things very simple to understand..... Hats off to your effort !!

[@pubgkiller2903]

You are the best teacher.. Thanks a lot

[@NilanshuSharma1]

Thanks. It's very clear. Piece of advice for viewers: These tutorials can easily be watched in 2x speed.

[@swatikorade5251]

i learn HDFS from last 7 days but still my concepts are not clear..but today i watched your video i am clear with everything...thank you

[@worthwatchingeslam]

Great explanation, thanks for your efforts :)

[@maliknauman3566]

Excellent explanation Sir, Hat's off.

[@anilkumar-dp1jk]

Awesome Sir ..Thank You

[@bgsuresh0]

Your explanation is very clear thank you. Kindly keep update the new videos.

[@ramswaroop1520]

What an Explanation 🙏🙏🙏🙏🙏🙏❤️❤️❤️❤️❤️❤️❤️

[@tarunrey619]

Explanation was clear. I have few questions ? 1)while setting cluster using Hadoop 2,Initially how will zookeeper elects the leader among the namenodes? 2)Can you explain the funcitonality of failcontrollers of namenode?

[@joker-cy6qo]

Bro i would love to answer When u setup a new cluster the NN will be the active NN which u have selected to be a NN AND Later if it fails the zkfc(zookeeper failover controller ) is responsible for making standby node as a active node Hope this will help u

[@joker-cy6qo]

When u set up a new cluster the active namenode will be the one which you selected and if NN goes down the zookeeper will work here the demand of zookeeper ZKFC which stands for zookeeper failover and it is responsible for making standby namenode active namenode

[@rohitbhagwat3031]

Great Work sir. Thanx for video.

[@eldos11]

This was beautiful! Thank you.

[@wajay2006]

Very good Tutorial. Only thing I want to say is fsimage is not only in memory but also stored on disk. Please excuse me if I am not correct on this point.

[@kumarpolisetty3048]

Really nice explanation. If you can start practical implementation of one POC with end to end project , it will be very useful for all of us. Thanks for your efforts and time.

[@mahalaxmanraochappedi4690]

Presentation and explanation was excellent..

[@tusharmayekar4649]

It was very good information.

[@amansehgal9917]

Highly recommended for anyone who wishes to learn about how fault tolerance is managed in HDFS. In addition to this, I've a question: Are block recovery, lease recovery and pipeline recovery done in addition to the methods describe in video for fault tolerance or these are done at deeper level of the described methods?

[@kanmanik5674]

Very good tutorial. Easy to understand.

[@surabhibtech]

very useful explaination

[@dineshshinkar2163]

Simple and superb explained

[@BhimSella]

Thanks for the detailed explanation.

[@anandansubash]

Thanks for your clear explanation. Awesome!

[@aasthajain6148]

Awesome sir...great explanation👌👌

[@renukaasodaria494]

very nice.I could not understand too much about secondary name node but will try to understand it.

[@ScholarNest]

Why? is it because the explanation is not clear? You can ask your doubts if there are any?

[@renukaasodaria494]

no explantn is so nice but my fsimages nd editlog is not clear so

[@renukaasodaria494]

nd thank u very much

[@rajivraghu9857]

Very nicely explained.

[@aks8989]

Very nice explanation!

[@sridharthogaru4403]

great and clear explanation thanks.

[@prometeo34]

Great Tutorial..thanks for sharing

[@sureshm6906]

Very informative. Thanks

[@nagamanickam6604]

Thank you sir

[@sujitunim]

Awesome tutorial

[@Sridevi-ht9nj]

very well explained

[@uddisasuresh9264]

Great explanation

[@avikthedrummer]

Hello! Is there any ppt format of this video? Need to explain students.. the representation is superb

[@nguyen4so9]

Excellent !

[@enriquewilliams8676]

Good.

[@krishnap6035]

Good lecture.

[@dhirenmistry167]

Superb...Thank you so much

[@shramandas2721]

Why cant we dump the fsimage directly to disk during restarting of the NameNode . After restarting it can read the fsimage and then push it to memory it will be faster.

[@maheshkumar3657]

nice tutorial sir

[@aakashpatel1003]

very good video

[@worthwatchingeslam]

Great work, I have 2 questions. -Regarding the checkpoint activity does the secondary NN keeps the "on Disk FS" Image on it's local HD or is it on the Active NN HD ? -and the hour between each checkpoint is it configurable?

[@nitskrishna]

nicely explained

[@mrionutube]

Thank you for this excellent tutorial. I am new to this topic and all the tutorials or blogs I went through, did not put up a clear picture of what is happening with Checkpoint process of SNN and that of NN too. So, can you please confirm my understanding about this topic (Related to NON HA mode) ?... 1) After every Checkpoint run, SNN clears the Edit Log on Name Node as well? So at any time, Edit log on NN has data only since the last Checkpoint run on SNN. 2) fsimage of the NN gets updated automatically in real time (i.e as and when changes are made to the file system). Which means , Name Node always has latest fsimage in its memory at all times. 3) At any given time fsimage on the Secondary Name Node holds file system image updated as of last Checkpoint run. 4) After a reboot, Name Node picks up the fsimage from the "Secondary Name Node" and the Edit Log from NN local disc and merges them to create new fsimage file which is up to date with all changes as of then.

[@pc0riginal870]

Thank you so much ...

[@aneksingh4496]

can u make a video why RDD is immutable and what would have happened had it not been immutable

[@sharathkalaallapuram5941]

Sir great explation sir. I have a dout sir 1)how to install cloudera without internet sir & and what is parcel method and packeges method.

[@sk-vs9nt]

it was clear about topic thank you so much , can you show with example

[@sabyasachiprasad8929]

Nice One

[@nileshkharat1188]

Why there's an odd no. Of JN 3 or 5?? What's the reason behind that

[@prasadkv9936]

Thanks. could you please explain how to create Cloudera cluster as now a days many clients are prefer cloudera instead of Hortonworks..

[@aniketamrutkar]

Awesome

[@coolguy171182]

Sir, What will happen, if the DN-1 is slow, and it does not send heartbeat as fast as compared to other nodes. If NN then thought that DN-1 is down and started replicating the data on different node say DN-2 and during replicating the data the DN-1's heartbeat reached to NN. Will it stop replicating the data on DN-2?

[@ScholarNest]

+Pranav Wagde, I think it is hypothetical question. Either I get the heartbeat within expected interval or I don't. There is no concept of slow heartbeat. If NN realized that the block is under replicated, it will make more replicas to fix it. There is no concept of stopping in between. Later when NN realizes that block is over replicated, it will fix that also by throwing away some replicas.

[@coolguy171182]

Thanks for the explanation. Understood the concept.

[@fasiuddin1874]

helpful

[@testingmakeseasy]

please upload some hive and pig related videos ..

[@ScholarNest]

sure, maybe in a month.

[@iotmails9519]

Can we have multiple replication factor for multiple tenants?

[@ScholarNest]

You can have it at the topic level and I guess all Tanents of the cluster are not going to share the topics. So, answer is a Yes.

[@VishalYadav-lw2ky]

Can we make a single node for both NameNode and as a Secondary NameNode..?

[@ScholarNest]

Yes, we can. However, we don't do it in production.

[@VishalYadav-lw2ky]

okk....thanks

[@navinnayak007]

how fsimage file and editlog file communicate each other?

[@karthiknedunchezhiyan7935]

fsimage will not communicate with editlog but during checkpointing process new fsimage will be created by merging old fsimage with new editlog

[@joker-cy6qo]

1.75 x

[@Deshammanideep]

Hadoop is very fault tolerant. The only point of failure can be Maharashtra State Electricity Board.

[@justACatOnYoutube]

Lol! You can keep backup in Inverters.. Its not costly.

[@ravikoganti227]

Great explanation