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It is almost impossible to get the above settings accurate to help in all possible situations (traffic, concurrent connections, network conditions etc). Due to this reason, a configurable workaround is proposed below that avoids the thundering herd completely. Justin Laue and Phil Sorber developed a the initial proof-of-concept patch for this solution and it is now being discussed to make a generic stale-while-revalidate solution within the core and possibly deprecate the existing plugin solution which doesn't work well due to the write lock issue.

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