thank you for asking. Unfortunately the LRA is still under development and we have not implemented the failover and scalability capabilities yet. Currently the Narayana LRA is a single node implementation where failover needs to be done manually.
Nevertheless we are aware of the importance of this functionality, we have this on our roadmap and we expect to address it soon. Just I can't tell you exact time frame for it.
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you could take a look at camel/lra.adoc at master · apache/camel · GitHub and I think you could use the camel route exception handler and the redeliver strategy when doing the failover.