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From Till Toenshoff <>
Subject Libevent bundling ahead.
Date Wed, 12 Sep 2018 01:14:48 GMT
Hey All,

We are considering bundling/vendoring libevent 2.0.22 with upcoming releases of Mesos.

Let me explain the motivation and then go into some details.

Due to, SSL builds Mesos stopped functioning
on distributions that offer libevent 2.1.8 by default. Specifically the failure was observed
on Ubuntu 17/18 as well as on macOS. It has also just come to my attention that Fedora 18
shares the same fate. So the problem is less likely OS specific but more likely libevent +
SSL + libprocess specific.
Instead of getting stuck in the rabbit hole of debugging right away, I decided that bundling
a known good version of libevent was the most reliable way to prevent sad faces when building
Mesos with SS but instead we can be sure SSL builds of Mesos function properly across all
supported platforms, out of the box.

Details on the bundling;
We will include libevent 2.0.22 and we also include a patch that makes that version build
against both openssl 1.0.x as well as 1.1.x. For unbundled builds (--with-libevent) I have
some additional checks foreseen that try to prevent a build of a known bad variant of libevent
+ SSL + Mesos.

The bundling and those checks are a workaround, not a solution. I still am pursueing debugging
the underlying cause. However, way too much time has passed already without a proper solution,
hence this suggestion of a quick fix, bundling workaround.

Let me know your thoughts!


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