Camel fail-over mechanism

[projectnash]

Hi,

We have four instance of gemfire distributed cache running in different 
machines. Distributed cache contains trade messages. Apache camel 
running in one of the machine reads JMS topic and populates this 
distributed cache. At any cost we don't want to introduce 
out-of-sequence in processing input JMS topic.

On the down side, every time Apache camel goes down (it is rare, but 
happened), we have to start the instance in the same machine (or another 
machine) manually. But running two difference instance, will end-up 
processing  out-of-sequence.

should we need to look into zookeeper for solution?, is there a way 
running four parallel camel instance, but only one could be guaranteed 
active at a given time, other instance can become active only if there 
are no other active instance available.

Could someone guide about how to handle this scenario for automatic 
failover?

Regards
Mohan