When we choose LongAdder and LongAccumulator over AtomicLong & AtomicInteger ?

By | August 15, 2019

In this blog post we will discuss about one of the very important java interview question When we choose LongAdder and LongAccumulator over AtomicLong & AtomicInteger ?

  • In case of when you have a very large amount of threads accessing the same atomic variable, performance suffers because the optimistic updates require too many retries. Java 8 came up with classes LongAdder and LongAccumulator to solve this problem.
  • A LongAdder class is from concurrent package is composed of multiple variables whose collective sum is the current value. When multiple threads can update different summands and new summands are automatically provided when the number of threads increases.
  • This is efficient in the common situation where the value of the sum is not needed until after all work has been done. The performance improvement can be substantial.

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That’s all about When we choose LongAdder and LongAccumulator over AtomicLong & AtomicInteger ?
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