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https://issues.apache.org/jira/browse/STORM-3066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16470344#comment-16470344
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Stig Rohde Døssing commented on STORM-3066:
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I don't think you can refer to elements in a list right now. Here's the code
doing property substitution
https://github.com/apache/storm/blob/master/flux/flux-core/src/main/java/org/apache/storm/flux/parser/FluxParser.java#L153.
As you can see it's fairly straightforward replacement of dollar-brace
patterns. You could probably add support for list/map lookups if you wanted to
by modifying the linked code.
> Storm Flux variable substitution
> --------------------------------
>
> Key: STORM-3066
> URL: https://issues.apache.org/jira/browse/STORM-3066
> Project: Apache Storm
> Issue Type: Bug
> Reporter: Calvin Chen
> Priority: Critical
>
> we are using flux to submit storm topology, for topology yml file, we need
> substitute variables, from
> [https://github.com/apache/storm/tree/master/flux], it says variable can be
> substituted in format of ${variable.name}, my question is, in my case,
> variable is a list, and I only want to get first element of the list, how can
> I do it?
> I try to use ${variable.0} and ${variable}[0], it doesn't work, after
> substitution, the result is element_name.0 or element_name[0], which is not I
> expected(expected one should be element_name), please let me know how to
> specify the first element of a list in flux.
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