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https://issues.apache.org/jira/browse/NIFI-3389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15838458#comment-15838458
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Bryan Rosander commented on NIFI-3389:
--------------------------------------

[~JPercivall] I agree that it isn't a great idea to put huge values into 
attributes.  That being said, this is a regression that was introduced in 
1.1.0.  Existing flows that put more than 64k into an attribute stop working 
when upgrading to 1.1.0 and later atm.

> 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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