[erlang-questions] how: Purging old records from Mnesia table

Scott Lystig Fritchie fritchie@REDACTED
Fri Mar 7 03:56:41 CET 2008

A few messages ago, someone said:

>> > Hence it is enough to use timer:send_after()

Gleb Peregud <gleber.p@REDACTED> wrote:

gp> I'm working on simple caching server. Allowing to specify if and
gp> when item will expire.

When having the expiration even sent by a 2nd party, you must avoid race
conditions somehow.  Example:

    Store tuple {Key, Value0}, expires at time T.
    Time T arrives
    Client stores {Key, Value1}, expires at time T2
    Server deletes Key
    Client attempts to fetch Key, fetch fails, client is sad.


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