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Subject: Re: It appears the wrong File seperator is used when
 dynamicConfigFile in zoo.cfg changes. (in 3.5.1-alpha)
From: Dean Voets <dean@motum.be>
In-Reply-To: <D2622B92.31F6A%cnauroth@hortonworks.com>
Date: Tue, 10 Nov 2015 09:53:56 +0100
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Message-Id: <BB9C40F2-B44C-45D1-912E-F3BAC31C3FC5@motum.be>
References: <0E48F6EE-4DB4-4C17-9C4C-530D18BFC455@motum.be>
 <D2622B92.31F6A%cnauroth@hortonworks.com>
To: user@zookeeper.apache.org

Hello Chris,

Thanks for your reply. Yesterday I have build version 3.5.2 locally and =
tested it on our test setup (with the computers we use on the vehicles). =
I=92m glad to report that everything works fine now.
The planning software that I mentioned is a distributed system with an =
instance on each vehicle deciding which order should be executed by =
which vehicle, what route to take etc. We use ZooKeeper mainly for =
keeping track of the state of the orders. ZooKeeper allows our system to =
continue working if not every vehicle is reachable.=20
Our last client often has multiple vehicles turned off because their =
factory is not working at full capacity yet. Therefore, it was very =
important for us to be able to reconfigure ZooKeeper depending on if the =
vehicle is in service or not. Vehicles that are out of service are =
changed to observers and when they are restarted they change back to =
participant.

Thanks again for your help,
Dean Voets

> On 06 Nov 2015, at 19:05, Chris Nauroth <cnauroth@hortonworks.com> =
wrote:
>=20
> Hello Dean,
>=20
> Wow, forklift automation!  That's a use case I haven't seen before for
> ZooKeeper.  :-)
>=20
> You are correct that this is a bug.  We have a fix already, and it =
will
> ship in ZooKeeper 3.5.2.  See issue ZOOKEEPER-2244 for more details.
>=20
> https://issues.apache.org/jira/browse/ZOOKEEPER-2244
>=20
>=20
> If you don't want to wait for the 3.5.2 release, then you could =
consider
> applying that patch manually yourself and rebuilding.  Also, if you =
don't
> need the ZooKeeper 3.5 features immediately, then another option would =
be
> to go back to ZooKeeper 3.4.  Our current stable release line is the =
3.4
> line.
>=20
> I hope this helps.
>=20
> --Chris Nauroth
>=20
>=20
>=20
>=20
> On 11/6/15, 9:59 AM, "Dean Voets" <dean@motum.be> wrote:
>=20
>> Hello,
>>=20
>> This week I got to know ZooKeeper by working on the distributed =
planning
>> system at work (in automation of fork lifts). I upgraded the =
zookeeper
>> version we use to the new 3.5.1 version to support a changing fleet =
size
>> using the dynamic reconfiguration in ZooKeeper.
>> During the initial tests on my development laptop (mac OS) everything
>> worked nicely. Unfortunately this changed when trying it on the =
embedded
>> windows systems used in our vehicles. Soon after starting the =
zookeeper
>> servers, a version is added in the filename of the dynamic =
configuration
>> file specified in zoo.cfg. The updated location of the file is saved
>> using \ as file seperator instead of / causing FileNotFoundExceptions =
in
>> QuorumPeerMain.=20
>> I=B9ve been looking for the cause of this for a while now but I=B9m =
stuck so
>> I hope someone can point me in the right direction to find the =
problem.
>> At this point I have no clue if this is caused by a mistake in
>> configuration from me (and what configuration that could cause this) =
or
>> if I should be looking at the zooKeeper classes for some windows =
specific
>> bug (or which class in zookeeper updates the zoo.cfg when the dynamic
>> configuration changes).
>>=20
>> Thanks in advance,
>> Dean Voets
>>=20
>>=20
>=20