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https://issues.apache.org/jira/browse/AMBARI-12787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14699474#comment-14699474
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Andrii Babiichuk commented on AMBARI-12787:
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+1 for the patch
> Add Host is only performing Hostname Resolution check for added hosts
> ---------------------------------------------------------------------
>
> Key: AMBARI-12787
> URL: https://issues.apache.org/jira/browse/AMBARI-12787
> Project: Ambari
> Issue Type: Bug
> Components: ambari-web
> Affects Versions: 2.1.0
> Reporter: Aleksandr Kovalenko
> Assignee: Aleksandr Kovalenko
> Priority: Critical
> Fix For: 2.1.2
>
> Attachments: AMBARI-12787.patch, c6401-2.tiff, c6403.tiff
>
>
> When hosts are added to the cluster, on Add Host, a Hostname Resolution check
> is performed. This checks on each host that the other hosts are resolving.
> For example, if you have Host1, Host2 and Host3. On each host, Ambari
> confirms Host1, Host2 and Host3 can resolve (by doing this).
> {code}
> socket.gethostbyname(host)
> {code}
> When adding hosts to a cluster via Add Host, Ambari performs the Hostname
> Resolution check but the list of hosts ONLY includes all added hosts, not any
> of the hosts already in the cluster. For example, if I add Host4 and Host5 to
> the cluster, Ambari will check that each of those hosts can resolve Host4 and
> Host5 but not Host1, Host2 or Host3. This can present a problem if these new
> hosts Host 4 and Host5 network is mis-configured. They might not be able to
> resolve the existing cluster hosts and therefore, once we get components
> installed and started, those components might not function in the cluster
> correctly. This can become a challenge to diagnose.
> Attaching a few screen shots showing what is happening. c6401 + c6402 are
> part of original cluster and both are passed with the host check. But when I
> add c6403, it doesn't include the existing hosts c6401/c6402 in the check.
> The solution is to include existing hosts in the list of hosts to check
> resolution. Understandably, this list might be large in a very big cluster,
> so an option is to ONLY include the set of hosts that include a Master
> Component (like NameNode, etc).
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