To be used on concurrency notes/post:
About thundering herd problem:
- https://lkml.org/lkml/2004/5/2/108
- http://www.citi.umich.edu/projects/linux-scalability/reports/accept.html (possible linux solution)
- https://en.wikipedia.org/wiki/Lock_convoy
About exponential backoff (lil bit related to thundering -can cause it?-):