Configuration Compatibility Check ignored when using Cluster(system).join(address)

[Frederic]

Hello all,

I've just done a few tests with the new Configuration Compatibility Check and noticed that no compatibility check is performed (aka checks are ignored) when joining the cluster manually using Cluster(system).join(address). Is that expected?

I didn't find any documentation explaining that Cluster.join() is not equivalent to Cluster.joinSeedNodes() apart from the argument type, am I missing something?

Thanks, Fred

[Patrik Nordwall]

It’s only part of the joinSeedNodes process. Perhaps that is missing in docs, and contribution fixing that is welcome.

/Patrik

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[frederic arno]

Thank you Patrick, I see this behavior is expected.

Considering joining a cluster manually, what is the difference between
the joinSeedNodes and the join processes?

What makes the join process so different that nodes' configurations do
not need to be checked for compatibility?

Thanks, Fred

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[Patrik Nordwall]

The config check fits better with the joinSeedNodes process. It’s done before the actual joining is done. I’d recommend to always use joinSeedNodes rather than join, also for manual joining. It can be a list with one entry.

We should probably change Akka management to use joinSeedNodes instead of join.

/Patrik