System Design Fundamentals

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Concurrency and Coordination

In distributed systems, multiple processes or components often need to work together concurrently, which can introduce challenges related to coordination, synchronization, and data consistency. Here's an overview of concurrency and coordination in distributed systems and the key aspects to consider:

A. Concurrency Control

Concurrency control is the process of managing simultaneous access to shared resources or data in a distributed system. It ensures that multiple processes can work together efficiently while avoiding conflicts or inconsistencies

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Shishir

· 2 years ago

Can you please elaborate on the difference between Strong Consistency and Linearizability? Thanks!

Simo

Simo

· 3 years ago

Both these strategies sounds like a process needs to wait for a condition to be met before proceeding. Can you give real-world examples for Barriers and Condition variables?

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atomicdefinition

· 3 years ago

I'm a bit confused about the differences between them. It seems like "concurrency control" is all about synchronizing multiple processes or threads, which is basically the same as "synchronization."

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dinko.osrecki

· 22 days ago

Isn't a mutex missing from the Synchronization list?

Also semaphores are really badly explained. Semaphores control how many threads can pass it and reach a resource pool. They can be either binary (open/closed), or counting semaphores (N > 1). Each thread that passes the semaphore increments the counter, and once N is reached other threads are blocked until one of existing threads exits the critical block and decrements the semaphore. Practical example is controlling access to the connection pool. Semaphores are like a capacity management tool.

Mutex, on the other hand, gives exclusive right to a single thread to access a resource. If many concertgoers are running to the toilet the first one that gets there will enter and lock it. Once they are done they will unlock it and the next one