The main point is to avoid keeping things in the page cache that are no
longer needed like compacted data that has been early opened elsewhere.

On Oct 18, 2016 11:29 AM, "Michael Kjellman" <>

> We use posix_fadvise in a bunch of places, and in stereotypical Cassandra
> fashion no comments were provided.
> There is a check the OS is Linux (okay, a start) but it turns out the
> behavior of providing a length of 0 to posix_fadvise changed in some 2.6
> kernels. We don't check the kernel version -- or even note it.
> What is the *expected* outcome of our use of posix_fadvise -- not what
> does it do or not do today -- but what problem was it added to solve and
> what's the expected behavior regardless of kernel versions.
> best,
> kjellman
> Sent from my iPhone

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