[omniORB] DNS caching

[Phil Bradbury]

We're trying to work with a remote CORBA object that lives on a server behind a redundancy/failover setup that uses DNS to point to the currently-active server. What we're finding is that omniORB is not following the DNS changes... it seems to be aggressively caching the DNS lookup.

In particular, it seems to cache DNS lookup failures - if we're restarting everything, and at the time our application starts up, the remote server is not yet available (and the DNS name does not resolve) then omniORB will cache that the DNS name resolves to nothing... and then later, when the DNS does resolve, attempting to connect to it will still give the same "no usable profiles" error.

We recently found reference in the docs to a "resolveNamesForTransportRules" setting, which seems like it should do exactly what we want, delay the DNS lookup to connection time... but that setting doesn't seem to exist in 4.2.2... if I'm reading correctly, it was added after that version was released, so this setting isn't in an actual release as yet.

What would you recommend we should do here? We would prefer to be using an official release over building the 4.2.x head version, but we could probably do that if it was the best solution... do you know of any good workaround to get this sort of thing working with 4.2.2? Or, are there any plans for releasing a 4.2.3?

Thanks,
Phillip Bradbury
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