Lock Granularity

Locking mechanisms can be implemented with different levels of granularity:

  • Global Lock: A single global lock protects all cache entries. While this approach is straightforward, it can introduce contention and limit concurrency.
  • Per-Entry Lock: Each cache entry has its own lock. This approach allows more concurrency but can lead to a high number of locks, increasing system complexity.

Note: The choice of lock granularity depends on the specific use case and the level of concurrency required.

How Cache Locks can be used to overcome Cache Stampede Problem?

Caching is a technique used to store data temporarily in a high-speed storage layer, such as memory or a dedicated cache, to reduce the latency and load on a primary data source, such as a database or a web service.

Important Topics for Cache Locks to overcome Cache Stampede Problem

  • Cache Stampede Problem
  • Locking Mechanism
  • Cache Population Process
  • Lock Release, Backoff, and Retry
  • Lock Granularity
  • Deadlock Avoidance
  • Conclusion

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Cache Stampede Problem

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Locking Mechanism

The Cache Stampede Problem occurs when multiple requests for the same piece of data (e.g., a web page, an API response, or a database record) are triggered simultaneously, and the data is not present in the cache. These simultaneous requests overwhelm the data source, leading to performance degradation, increased latency, and potential system instability....

Cache Population Process

To tackle the Cache Stampede Problem, a locking mechanism is used. Locking ensures that only one request is responsible for regenerating the expired or invalidated data, while other requests wait until the data is refreshed. Here’s how the locking mechanism works:...

Lock Release, Backoff, and Retry

The cache population process involving locking typically follows these steps:...

Lock Granularity

Locks must be managed carefully to ensure that they are released in a timely manner. After data regeneration and cache update, the lock should be released to allow other requests to proceed. However, if the data regeneration process encounters an error or takes an unusually long time, it is essential to implement mechanisms for lock release, backoff, and retry:...

Deadlock Avoidance

Locking mechanisms can be implemented with different levels of granularity:...