Open Stack

Awesome. Thanks for tracking this down. Knowing that other big players are running production systems in that configuration makes us much more comfortable with the idea. :)

Kevin
________________________________________
From: Joshua Harlow [harlowja at fastmail.com]
Sent: Friday, November 06, 2015 10:55 AM
To: OpenStack Development Mailing List (not for usage questions)
Subject: [openstack-dev] [all] [dlm] Zookeeper and openjdk, mythbusted

I just wanted to bring this up in its own thread as I know it was a
concern of (some) folks at the DLM session in tokyo[0] and I'd like to
try to bust this myth using hopefully objective people/users of
zookeeper (besides myself and yahoo, the company I work for) so that
this myth can be put to bed.

Basically here is the TLDR of the question/complaint:

'''
Zookeeper, a java application, will force you to install oracles virtual
machine implementation for it to work, and it doesn't work with the
openjdk, and if tooz (and oslo library) has a capable driver that uses
zookeeper internally (via kazoo @ http://kazoo.readthedocs.org) then it
will force deployers of openstack and its components that will use more
of tooz to install oracles virtual machine implementation.

This will not work!!
There is no way I can do that!!
Yell!! Shout!! Cry!!
'''

That's the *jist* of it (with additional dramatization included).

So in order to dispel this, I tried in that session to say 'actually I
have heard nothing saying it doesn't work with openjdk' in that session
but the voices did not seem to hear that (or they were unable to listen
due to there emotions stressed/high). Either way I wanted to ensure that
people do know it does work with the openjdk and here is a set of
testimonials from real users of zookeeper + openjdk that it does work there:

 From Min Pae[1] on the Cue[2] team:

'''
<@sputnik13> harlowja for what it's worth we use zookeeper with openjdk
'''

 From Greg Hill[3] who works on the rackspace bigdata[4] team:

'''
<jimbobhickville> and yes, we run Zookeeper on openjdk, and we haven't
heard of any problems with it
'''

 From Joe Smith[5][6] (who is at twitter, and is the Mesos/Aurora SRE
Tech Lead there):

'''
<Yasumoto> and yep, we (twitter) use zookeeper for service discovery
<Yasumoto> someone asked me that question back at mesoscon in seattle,
fwiw https://youtu.be/nNrh-gdu9m4?t=34m43s
<harlowja> Yasumoto do u know if u use openjdk or oraclejdk?
<Yasumoto> harlowja: yep, openjdk7
<Yasumoto> but we're migrating up to 8
'''

 From Martijn Verburg who is an an openjdk developer (and CEO)[7][8]
that has some insightful info as well:

'''
So OpenJDK and Oracle JDK are almost identical in their make up
*especially* on the server side. Many, many orgs like Google, Twitter,
the biggest investment bank in the world, all use OpenJDK as opposed to
Oracle's JDK.

-------

The difference is the quality of the OpenJDK binaries built and released
by package maintainers.

If you are getting IcedTea from RedHat (their supported OpenJDK binary)
or Azul's Zulu (Fully supported OpenJDK) then you're *absolutely fine*.

If you're relying on the Debian or Fedora packages then *occasionally*
those package maintainers don't put out a great binary as they don't run
the TCK tests (partly because they can't as they are unwilling/unable to
pay Oracle for that TCK).

Hope that all makes sense...
'''

So I hope the above is enough of *proof* that yes the openjdk is fine,
there may have been some bugs in the past, but those afaik have all been
resolved and there are major contributors stepping up (and continuing to
step up) to make sure that zookeeper + openjdk continue to work (because
companies/projects/people... like mentioned above depend on it).

-Josh

[0] https://etherpad.openstack.org/p/mitaka-cross-project-dlm
[1] https://launchpad.net/~sputnik13
[2] https://wiki.openstack.org/wiki/Cue
[3] https://launchpad.net/~greg-hill
[4] http://www.rackspace.com/cloud/big-data
[5] http://www.bjoli.com/
[6] https://github.com/Yasumoto
[7] http://martijnverburg.blogspot.com/
[8] http://www.infoq.com/interviews/verburg-ljc

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