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https://issues.apache.org/jira/browse/MINIFI-117?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15616412#comment-15616412
 ] 

ASF GitHub Bot commented on MINIFI-117:
---------------------------------------

Github user JPercivall commented on a diff in the pull request:

    https://github.com/apache/nifi-minifi/pull/45#discussion_r85601260
  
    --- Diff: 
minifi-toolkit/minifi-toolkit-configuration/src/main/java/org/apache/nifi/minifi/toolkit/configuration/ConfigMain.java
 ---
    @@ -336,6 +329,16 @@ public int transform(String[] args) {
             return SUCCESS;
         }
     
    +    protected void validateAndPrintIssues(ConfigSchema configSchema) {
    +        if (!configSchema.isValid()) {
    +            System.out.println("There are validation errors with the 
template, still outputting YAML but it will need to be edited.");
    +            
configSchema.getValidationIssues().forEach(System.out::println);
    --- End diff --
    
    I don't think the validation issues are getting cleared properly along the 
way:
    
    ![screen shot 2016-10-28 at 4 08 01 
pm](https://cloud.githubusercontent.com/assets/11302527/19820707/8646849c-9d28-11e6-840c-d44a5812a78e.png)
     


> Maintainable Configuration Versioning
> -------------------------------------
>
>                 Key: MINIFI-117
>                 URL: https://issues.apache.org/jira/browse/MINIFI-117
>             Project: Apache NiFi MiNiFi
>          Issue Type: Bug
>            Reporter: Bryan Rosander
>            Assignee: Bryan Rosander
>
> In order to avoid a tangled web of if/else statements around every possible 
> permutation of config.yml and an equally complicated validation routine, we 
> need to utilize a versioning strategy that allows for specific parsing and 
> validation code for each version of the ConfigSchema.
> This will allow us to determine if a schema will be compatible with an older 
> MiNiFi instance more easily by validating the structure of the file at a 
> given version while still supporting an upconvert on read to the latest 
> ConfigSchema while parsing at runtime.
> It should also facilitate a deprecation strategy of removing older versions' 
> classes without needing to touch current implementation



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