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From: Claus Ibsen <claus.ibsen@gmail.com>
Date: Sat, 13 Oct 2012 10:32:19 +0200
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 <CAGB5yNmX+82Jo=P_xzx-GOvyq7UDa=_-nWW4VyLYhZk0xwzrSw@mail.gmail.com>
Subject: Re: Single instance of running route in the cluster
To: users@camel.apache.org
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On Wed, Oct 10, 2012 at 3:26 PM, Zhemzhitsky Sergey
<sergey_zhemzhitsky@sberbank-cib.ru> wrote:
> Hello guys,
>
> What is the best way to have a single instance of running route in the cl=
uster (multiple instances of the same route deployed on the different conta=
iners)?
> The example of such a requirement is a ftp/smpp access with a limited num=
ber of connections. So only one instance of route is allowed to run at any =
single point of time.
>
> Currently there is ZooKeeperRoutePolicy that seems to fit these requireme=
nts, but it seems to lock the routes only when an exchange is already start=
ed, i.e. ftp connection has been established (look at onExchangeBegin here =
http://camel.apache.org/maven/camel-2.9.0/camel-zookeeper/apidocs/org/apach=
e/camel/component/zookeeper/policy/ZooKeeperRoutePolicy.html#onExchangeBegi=
n%28org.apache.camel.Route,%20org.apache.camel.Exchange%29)

That code ought to be triggered on the onInit callback, then the
leader election can be run prior to routes starting up.
If not then feel free to log a JIRA and as usual we love
contributions, so patches is welcome.


> Also for this issues Hazelcast with its distributed locks can be used.
>
> So what is the best way to have the backup routes and only single running=
 route among the multiple similar routes?
> Does camel have a standard solution for such issues?
>

Zookeeper is good but it requires to run zookeeper instances. There is
also quartz which has a logic for this.

And then there is Fuse Fabric which has this baked in as well.
http://fabric.fusesource.org/


> Best Regards,
> Sergey
>
>
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--=20
Claus Ibsen
-----------------
Red Hat, Inc.
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Author of Camel in Action: http://www.manning.com/ibsen