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https://issues.apache.org/jira/browse/NIFI-6918?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Pierre Villard resolved NIFI-6918.
----------------------------------
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Apache NiFi 1.x is no longer maintained and no new release is planned on the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.
> Impossible to fill AVRO fixed type from JSON
> --------------------------------------------
>
> Key: NIFI-6918
> URL: https://issues.apache.org/jira/browse/NIFI-6918
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.9.2
> Reporter: Floran Stuijt
> Priority: Major
>
> Currently I'm using the ConvertJsonToAvro-processor. The AVRO output schema:
>
> {noformat}
> {
> "type":"record",
> "name":"Message",
> "namespace":"com.example",
> "fields":[
> {
> "name":"MAC",
> "type":{
> "type":"fixed",
> "name":"MY_FIXED_TYPE",
> "size":6
> }
> }
> ]
> }{noformat}
>
> The input JSON-forms I tried are:
>
> {noformat}
> { "MAC": [ 0, 1, 2, 3, 4, 5] }
> { "MAC": "012345" }
> {"MAC":"\u0000\u0001\u0002\u0003\u0004\u0005"}
> {"MAC":{"MY_FIXED_TYPE": "\u0000\u0001\u0002\u0003\u0004\u0005"}}
> {noformat}
>
> Unfortunately none of them worked for me. I also tried the
> ConvertRecord-processor instead of the ConvertJsonToAvro-processor. Also
> without any luck.
>
> It seems that, after some further investigation, the ConvertJsonToAvro
> processor *_can't_* be used to generate Avro {{FIXED}} or {{BYTES}} datum.
> (source:
> [https://stackoverflow.com/questions/58391291/writing-avro-fixed-type-from-json-in-nifi|https://stackoverflow.com/questions/58391291/writing-avro-fixed-type-from-json-in-nififor])
> # The NiFi ConvertJsonToAvro uses the KiteSDK to interpret JSON into Avro
> data. This JSON-to-Avro conversion is _not_ the same as Avro JSON encoding
> from the specification.
> # This processor reads the incoming string into a [jackson
> JsonNode|https://github.com/kite-sdk/kite/blob/cdd699a1818c8d6c573b2789ef2edf9d340c0827/kite-data/kite-data-core/src/main/java/org/kitesdk/data/spi/JsonUtil.java#L65].
> # {{FIXED}} and {{BYTES}} types need to correspond to a JsonNode where
> [{{isBinary()}} is
> true|https://github.com/kite-sdk/kite/blob/cdd699a1818c8d6c573b2789ef2edf9d340c0827/kite-data/kite-data-core/src/main/java/org/kitesdk/data/spi/JsonUtil.java#L324].
> # As far as I can tell, parsing a JSON string with Jackson _never_ generates
> such a JSON node.
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