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https://issues.apache.org/jira/browse/NIFI-945?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14962777#comment-14962777
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Tony Kurc commented on NIFI-945:
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Reviewed pull request, and made some modifications. I left out guava and had
propertydescriptor initialization in same style as other processors (which left
it only there for a test annotation). Really struggled with whitespace on this
pr for some reason. Rebased it off of master. branch "pr/945" is ready for
review.
Also modified the properties to align with NIFI-967, opening the door for other
container options like [~rdblue] mentioned.
> New property (wrap as array) in avro2json converter
> ---------------------------------------------------
>
> Key: NIFI-945
> URL: https://issues.apache.org/jira/browse/NIFI-945
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Core Framework
> Reporter: Joe Mészáros
> Assignee: Tony Kurc
> Priority: Minor
> Labels: avro, improvement, json
>
> Create a new property (wrap as array) in ConvertAvroToJson, which determines
> how stream of records is exposed: either as a sequence of single Objects
> (false), writing every Object to a new line, or as an array of Objects.
> Default value is true, meaning that the Avro content is exposed as a sequence
> of root-level Object entries. False value is useful, when you want to write
> your records as single instances to a target component (e.g. Kafka).
> Let's assume you have an Avro content as stream of events:
> {noformat}({"id":"user1", "item":"itemX", "action": "buy"}, {"id":"user2",
> "item":"itemY", "action": "like"}){noformat}
> If wrap as array is false, the converter will expose the records as sequence
> of single JSON objects:
> {noformat}
> {"id":"user1", "item":"itemX", "action": "buy"}
> {"id":"user2", "item":"itemY", "action": "like"}
> ...
> {"id":"userN", ...}
> {noformat}
> Please bear in mind, that the final output is not a valid JSON content. You
> can then forward this content e.g. to Kafka, where every record will be a
> single Kafka message.
> If wrap as array is true, the output looks like this:
> {noformat}
> [{"id":"user1", "item":"itemX", "action": "buy"},{"id":"user2",
> "item":"itemY", "action": "like"},...,{"id":"userN", ...}]
> {noformat}
> It is useful when you want to convert your Avro content to a valid JSON array.
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