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https://issues.apache.org/jira/browse/NIFI-3389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15838311#comment-15838311
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Joseph Percivall commented on NIFI-3389:
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[[email protected]] increasing this size seems to be promoting an 
anti-pattern to me. Putting >65535 bytes into a single attribute value or name 
would indicate to me that the Flow it self is ill-designed. Is there a specific 
use-case you have in mind where this would be a suggested/recommended thing to 
do?

> FlowFileSchema writes attribute name and value as STRING instead of 
> LONG_STRING
> -------------------------------------------------------------------------------
>
>                 Key: NIFI-3389
>                 URL: https://issues.apache.org/jira/browse/NIFI-3389
>             Project: Apache NiFi
>          Issue Type: Bug
>            Reporter: Bryan Rosander
>            Assignee: Bryan Rosander
>
> This causes errors when the names or values of attributes exceeds 65535 bytes 
> when encoded as UTF-8.
> The fix would be pretty trivial but it has backwards compatibility 
> implications and the schema will need to be versioned to still be able to 
> read old flow files.



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