[jira] [Created] (AMBARI-2277) Improve host checking on registration

["Sumit Mohanty (JIRA)" <ji...@apache.org>]

Sumit Mohanty created AMBARI-2277:
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             Summary: Improve host checking on registration
                 Key: AMBARI-2277
                 URL: https://issues.apache.org/jira/browse/AMBARI-2277
             Project: Ambari
          Issue Type: Bug
          Components: controller
    Affects Versions: 1.2.4
            Reporter: Sumit Mohanty
             Fix For: 1.2.5


Host registration commonly fails on two scenarios:

1) Agent machine can't make it back to Server (results in failed host register because Server never sees host register)
2) Agent machine registers with Server under a _different_ hostname than Server expected (results in failed register because Server thinks host never registered)

Need to consider how to make these scenarios 1) easier to troubleshoot 2) more clear to the user 3) provide paths out of this situation (warn, retry, remove)

One limiting factor we have during registration currently is that we are assuming a hostname matches up. One (possible) way to alleviate this can be to provide a context, which can be any random string, that we send to the host which is returned during the registration call. If we can somehow match the context with what the host provides, we can then offer some meaningful warnings if there is a hostname mismatch.
We would have to do this BEFORE saving the hostname in the database.
Such a mechanism cannot block registration because, for example, we offer custom host name scripts from the agent. In that case, either a) the hostnames will match up anyway because registration is manual at that point or b) the user knows what he's doing and can just skip past it.

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