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https://issues.apache.org/jira/browse/AMBARI-15731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15228234#comment-15228234
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Antonenko Alexander commented on AMBARI-15731:
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+1 for the patch
> Host not expanding more than one field in host-name pattern
> -----------------------------------------------------------
>
> Key: AMBARI-15731
> URL: https://issues.apache.org/jira/browse/AMBARI-15731
> Project: Ambari
> Issue Type: Bug
> Components: ambari-web
> Affects Versions: 2.1.2
> Reporter: Aleksandr Kovalenko
> Assignee: Aleksandr Kovalenko
> Priority: Critical
> Fix For: 2.4.0
>
> Attachments: AMBARI-15737.patch
>
>
> PROBLEM
> FQDNs follow patterns such as cluster-[1-5].az[1-3].domain and potentially
> even more complex patterns, the current wizard only supports expansion of the
> first [a-b] pattern. This can be found in the file
> /ambari/ambari-web/app/controllers/wizard/step2_controller.js
> in the function parseHostNamesAsPatternExpression:
> Processing additional expansion would be desirable. Failing that, searching
> for further patterns and noting they aren't supported would be helpful. Or
> some other mechanism to allow users to specify some pattern that is more
> complex that the first [] pair would be helpful.
> EXPECTED
> hostname expansion behaves more like regex expressions, or supports several
> in a hostname expression
> ACTUAL
> Only the first [ ] pair is expanded, based on the following code
> parseHostNamesAsPatternExpression: function () {
> 337 this.set('isPattern', false);
> 338 var self = this;
> 339 var hostNames = [];
> 340 $.each(this.get('hostNameArr'), function (e, a) {
> 341 var start, end, extra = {0: ""};
> 342 if (/\[\d*\-\d*\]/.test(a)) {
> 343 start = a.match(/\[\d*/);
> 344 end = a.match(/\-\d*]/);
> 345
> 346 start = start[0].substr(1);
> 347 end = end[0].substr(1);
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