Core Java With OCJP/SCJP: Concurrent Collections Part-4 || ConcurrentHashMap Details

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[prakherjindal]

HashMap vs HashTable vs ConcurrentHashMap - 01:35 - 10:35
internal of ConcurrentHashMap - 14:05(check content of board)
constructors of ConcurrentHashMap - 16:40 - 18:35

[kartheekgoud]

Whenever i search for a topic many times your tutorial got in search, I never watched. But recently I made your videos prioritized 1st. Your giving indetail explaination for every topic. Thank you..

[sanketkhose]

Next level teaching ❤️ sir hats off literally i got frustrated due to surfing on internet about concurrent but i saw this video i stop solution i got Thankyou ✅️

[ryan-boxi]

I am a former student of Durga sir and am working now for a Big 4 Giant IT company . The way he teaches the basics cannot be taught by any java language developer who are working in Oracle or take any faculty or R&D guy. This is the simplest form of java food available on planet earth . Have it while you have time. Kudos sir !!!

[omnamahshivaya]

Thanks sir, you are really GOD of Java.

[DivuSiddhu]

Excellently explained to core important basic concepts in depth with clear UNDERSTANDING, keep posting such important topic videos Durga Sir, Appreciate in deed.

[dkk]

Thanks Sir, today I got the clear understanding on the ConcurrentHashMap to some extent.

[narendrakjha]

Incorrect information at 10:00 - When concurrencyLevel is greater than intialCapacity. it is not that every bucket has two lock, rather intialCapacity is made equal to concurrencyLevel.
below is the source code which does this.

if (initialCapacity < concurrencyLevel) // Use at least as many bins
initialCapacity = concurrencyLevel; // as estimated threads

That means concurrencyLevel can never be greater than intialCapacity. It will always be less than or equal to intialCapacity.

[karthikch]

very clear explanation sir.I was searching for other websites for clear understanding but i couldn't get it.Here in this video your explanation about the topic is excellent sir.

[persistencej]

thank you so much durga sir for your tutorials ... your tutorials are very valuable

[saravanaraj]

i never ever seen a person teaches like u sir 💯

[ranveervaghela]

Completed watching on Oct 13, 2024 at 12.42 AM

[priyankatiwari-lygf]

Awesome explanation...thank u so much Sir

[EngineerVaibhav]

ConcurrentHashMap initial capacity is 16
Fill ratio is 0.75
Concurrency level is 16❤

[yugalchaudhari]

You explained ConcurrentHashMap very well. Thank you sir.

[haykmkrtchyan]

Note that in Java 8 we don't have segment locking or concurrency level. In Java 8, each hash bucket can get updated individually, so as long as there are no hash collisions, there can be as many concurrent updates as its current capacity.

[amitkumargupta]

What will happen if one thread is reading from a particular bucket and other thread is updating the same bucket? Is it even possible? Will the latest value be available for read operation?

[chetankhandave]

Very good explanation sir, but I have doubt on load factor because in documentation "loadFactor: the load factor (table density) for establishing the initial table size".
when I pass any argument as load factor then it is used to calculate size of array to store elements,
public ConcurrentHashMap(int initialCapacity, float loadFactor, int concurrencyLevel)
{
if (!(loadFactor > 0.0f) || initialCapacity < 0 || concurrencyLevel <= 0)
throw new IllegalArgumentException();
if (initialCapacity < concurrencyLevel) // Use at least as many bins
initialCapacity = concurrencyLevel; // as estimated threads
long size = (long)(1.0 + (long)initialCapacity / loadFactor);
int cap = (size >= (long)MAXIMUM_CAPACITY) ? MAXIMUM_CAPACITY : tableSizeFor((int)size);
this.sizeCtl = cap;
}
If I pass load factor as 0.5 then also it resizes table after filling it 75% not after 50%.
I am using java 8, please help me to understand it.

[SHIVASAIAKULA-ty]

Hello sir, Why can't you start teaching SpringBoot...it will be very helpful for us🙃🥲

[samadhanjadhav]

Can in one segment update operation perform parralely or not ?