ConcurrentHashMap How It Works Internally. Asked by tech companies in phone screen interview rounds.

[@jacksonjohn2181]

Very helpful.. thanks 🎉

[@maksrane100]

Glad it was helpful!

[@gokulkadnar706]

Correction - Not arrayList its linkedList sir

[@bilalhayat1]

Gd explanation!

[@pavlodiachuk987]

In Concurrent HashMap it is not allowed to contain null key or value

[@subasreesuriyakumar3442]

Thanks a lot🙏🙏🙏

[@maksrane100]

You're welcome 😊

[@dhareppasasalatti7102]

Thank you so much for this.. Expecting more videos from your channel

[@maksrane100]

Sure 😊 You may want to check playlists on this channel : Leetcode & Lintcode Solved Coding Problems Codeforces And many others are there....

[@learnprogramming6930]

Thank you

[@maksrane100]

You're welcome.. Keep watching..

[@sourabhjain3920]

good explanation...

[@maksrane100]

Glad you liked it

[@shwetapriyadarshani197]

hi, i have one doubt, if i am modifying the node with key 101, can another thread read that particular node at the same time ? because read operations aren't blocked in Concurrenthashmap

[@maksrane100]

In ConcurrentHashMap, at a time any number of threads can perform retrieval operation but for updated in the object, the thread must lock the particular segment in which the thread wants to operate. This is called as Segment locking. Hope this helps.

[@shwetapriyadarshani197]

So what If one thread read the value just before updating that value and at the same time updation on that node happened. Say node at node 101, i am updating it's value to 501 and a thread comes to read its value, it reads 101 just before updating. So the thread will read stale value right? So how this is resolved

[@mad005]

Yes it will read a stale value, since the read came before the write

[@shravankumar-me5xi]

What happens if we read the data from a segment when it is locked..??

[@SHUBHAMVARDAAN]

worst video, presenter is very confused about what he is presenting .

[@AjithYadavT]

Concurrenthashmap is slow compare with hashmap

[@maksrane100]

ConcurrentHashMap performance is low sometimes because sometimes threads may be required to wait on ConcurrentHashMap. In case of HashMap performance is comparitively high because it is non-synchronized in nature and any number of threads can perform simultaneously.