[jira] [Commented] (NIFI-4957) Enable JoltTransformJSON to pickup a Jolt Spec file from a file location

["Jerry (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NIFI-4957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17029744#comment-17029744 ] 

Jerry commented on NIFI-4957:
-----------------------------

I have noticed that there hasn't been progress on this open issue (NIFI-4957).

Nevertheless I tried placing the Jolt spec in a processor group variable (e.g. jspec) and then using this variable in the JoltTransformJSON processor ( Jolt Specification = ${jspec} ) and it transformed the JSON FlowFile successfully.
Hence an intermediate solution (until NIFI-4957 is resolved) could be to update the processor group variable at the cost of resetting NiFi.

I have also investigated this working process but the Jolt specification has a *character limit*:
1.- Get Jolt Spec from file ( periodically with a CRON )
2.- Put FlowFile ( Jolt Spec ) in Distributed Map Cache with e.g. Cache Entry Identifier = jspec
3.- Fetch Distributed Map Cache (as and when required to transform the JSON FlowFile) and put cache value in attribute jspec
4.- Assign jspec to Jolt Specification of JoltTransformJSON processor

Will there be any progress on this open issue?

> Enable JoltTransformJSON to pickup a Jolt Spec file from a file location
> ------------------------------------------------------------------------
>
>                 Key: NIFI-4957
>                 URL: https://issues.apache.org/jira/browse/NIFI-4957
>             Project: Apache NiFi
>          Issue Type: Improvement
>            Reporter: Ryan Hendrickson
>            Assignee: Ryan Hendrickson
>            Priority: Minor
>         Attachments: image-2018-03-09-23-56-43-912.png
>
>
> Add a property to allow the Jolt Spec to be read from a file on disk and/or the classpath.
> !image-2018-03-09-23-56-43-912.png!



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