[
https://issues.apache.org/jira/browse/NIFI-5093?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Pierre Villard resolved NIFI-5093.
----------------------------------
Resolution: Feedback Received
Apache NiFi 1.x is no longer maintained and no new release is planned on the
1.x release line. Marking as resolved as part of a cleanup operation. Please
open a new one with an updated description if this is still relevant for NiFi
2.x.
> ConvertAvroToJson
> -----------------
>
> Key: NIFI-5093
> URL: https://issues.apache.org/jira/browse/NIFI-5093
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.6.0
> Environment: Ubuntu / Chromium
> Reporter: Matt Forrester
> Priority: Minor
>
> ConvertAvroToJson does not follow the expectations of anyone who knows JSON
> or JavaScript when there are zero Avro records coming from upstream. For a
> zero length sequence the outputs are:
>
> JSON Container Options: array
> Wrap Single Record: false
> Result: {}
> Expected Result: ''
> Why is this wrong?: This has not been wrapped in an array as specified
> and in any no items were sent from upstream, not one item with zero fields
>
> JSON Container Options: array
> Wrap Single Record: true
> Result: [{}]
> Expected Result: '[]'
> Why is this wrong?: This is one item with no fields that was never sent
> from the upstream.
>
> JSON Container Options: none
> Wrap Single Record: false
> Result: ''
> Why is this wrong?: This is one item with no fields that was never sent
> from the upstream.
>
> JSON Container Options: none
> Wrap Single Record: true
> Result: ''
> Why is this wrong? This is one item with no fields that was never sent
> from the upstream.
>
> IMHO these options are specifying two things for what should actually be one
> thing. In JSON, which is a subset of JavaScript an Object is represented as
> {} and an Array is represented as [].
> If you have a stream of objects they could either:
> * Be wrapped in `[]` and seperated by comma's making the whole document
> valid JSON, for example `[]` or `[\{"name":"ben"},\{"name":"jane"}]`
> * Formatted as NDJSON which would be `''` (0 bytes) or
> `\{"name":"ben"}\n\{"name":"jane"}\n` where every line is valid JSON with a
> final new line at the end.
>
> UPDATE: Have created a new Processor which follows the NDJSON spec closer
> with respect to new lines. The downstream SplitJSON seems much happier. It is
> available at [https://github.com/forbesmyester/NiFi-ConvertAvroToClassicJSON]
> .\{{}}
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