Understanding how ForkJoinPool works

ForkJoinPool is an advanced version of ThreadPoolExecutor with concepts like work-stealing which enable faster and efficient solving of divide and conquer algorithms.

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Master difficult programming concepts in few minutes. I try to explain difficult concepts like Java concurrency in simple to understand manner using animations and small code snippets. Explore videos on topics like Spring Boot, Cloud Foundry, Java 8 (with more coming soon). I am happy to clarify your doubts. Ask me anything in the comments. I am also happy to take requests for new videos.

New video added every Sunday.

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[karandua]

Watched your ExecutorService series, now came to this one. Really needed this set of videos. Nobody could have explained these concepts in so less time! SAVIOUR.

[kalyanbhadra]

In the last many years, I was trying to understand these topics and never understand them fully, unless used some of them in projects. Your videos are awesome. You made videos with topics which are hardest to understand and in a so simple way that I never found before.
Thanks a lot. You saved lot of us.

[kimsung]

Bro - that was a cool video. I also watched your ExecutorService one which was great!

[chanderprakash]

Seriously i really appreciate your work and the way you simplified all these concepts.

[aaravpilligundla]

Complex concept(MULTI THREADING) is explained in much simpler way, where an average . like me can also easily understand all the multithreading concepts...If anyone wants to master multithreading, these videos will help a lot..Great job bro..

[narayanadhurti]

Splendid and Explanation with an intoxicating voice.

[criticalthinking]

Thank you to explain this simply and clearly.

[jineshsanghvi]

I have 2 questions -
1. One of the thread (from the thread pool) pick the main task from the common queue and breaks it into subtasks and stores on its own local Deque. It then process each subtask in squence. In that case there is no parallelism involved but there is over head to break the main task into subtasks and then later joining the results (when no work stealing involved). This will be an over head. Aren't we better off just to execute the main task in whole ?

2. In the earlier part of the video, you mentioned that the main task is split into subtasks and these subtasks will run in parallel on different cores. In that case where is the local Deque involved ? Or is that the sub tasks will run in parallel on when other thread has no other main task to executed (no other task in the common queue)... Work Stealing.

Overall, its a good vidoe and i have gone through all you other videos. Easy to understand both with language and graphics. Commdendable job!

[RohitSharma-kebq]

Merge sort would have been good example for Fork Join. Nice work by the way. Awesome content.

[subramanyamsattenapalli]

The way of explanation is simply superb. Any one can easily understand.

[bharathashok]

Please provide a working programming example of ForJoinPool. Thanks for sharing knowledge.

[filipfolkesson]

You are making this course too easy! Thanks a lot

[manjuwadhwa]

Please make more such videos focusing interview topics...your videos are quick and to thenpoint..awesome, Thanks.

[VikiSangani]

Very nicely explained, please keep posting such videos. Thank you very much.

[mahendharkhedhar]

I'm big fan of u r teaching, always eagerly waiting for u r vedios sir really, we are very lucky to have you in this channel

[RaviPatel-pogu]

Great Videos
is it possible to cover the life cycle of Thread and its methods, how it works, ExecutorSerivice -> how it works internally, how it will reuse the same threads, in the prospective of the code

[tulikamal]

Nicely explained, thank you very much

[BhawaniSingh-jccw]

Now I feel it is very simple ...Great...Thanks :)

[chinthakadharmasiri]

awesome explanation.!!! nicely explained and really liked the fibonacci example..!!

[daelous]

Really usefull, i can understand this, thank you men.