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From César Álvarez Núñez <cesar.alvarez.nu...@gmail.com>
Subject Re: Running an ensemble in one JVM
Date Wed, 19 Oct 2011 08:42:11 GMT
Yes it is.

Just use "org.apache.zookeeper.test.QuorumUtil" methods; but you need to
checkout Zookeeper from its repository and compile it since distribution
does not include 'test artifacts' (

You will also need to apply the following patches:

   - https://issues.apache.org/jira/browse/ZOOKEEPER-1172 > It allows to
   specify an StatisHostProvider where server addresses are not shuffled; so
   you know in advance which server the client is connected to and shutdown it
   to force a Disconnected event.
   - https://issues.apache.org/jira/browse/ZOOKEEPER-1214 > It fix a bug
   that prevented to work with the ensemble in one jvm.

Regrettably, the above patches are not committed yet and where generated
from zookeeper-trunk; so for the time being you need to use zookeeper-trunk
instead of latest release (3.3.3).

I've successfully simulated Disconnected, SyncConnected and Expired events;
so let me know if you need more help.


On Wed, Oct 19, 2011 at 8:42 AM, Gunnar Wagenknecht

> Hi,
> Is it possible to run an ensemble in one JVM?
> I'd like to write some unit tests for our application in order to test
> the robustness of my application regarding connection loss, connection
> recovery and session expiration with an ensemble setup.
> I did start several quorum peers in the same JVM but I noticed some
> strange warning messages in the console. Thus, I'm wondering if that
> scenario is possible at all. I haven't look at the code yet in detail if
> there are some static references which would prevent that.
> For now, I'm starting three separate processes. Each process opens a
> command window so that I can see the process output. However, this
> requires some setup for running the tests and there are a few other
> issues. Thus, I'm looking for alternatives.
> How do you write tests with an ensemble?
> -Gunnar
> --
> Gunnar Wagenknecht
> gunnar@wagenknecht.org
> http://wagenknecht.org/

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