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https://issues.apache.org/jira/browse/NIFI-4215?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16112166#comment-16112166
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James Wing commented on NIFI-4215:
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[~markap14], would you please expand a bit on the immutability concern and what
criteria we should apply to a solution? Although the changes we introduced
would mutate the SimpleRecordSchema once after creation, I don't believe it
would have introduced or permitted widespread updates outside the initial
creation and configuration. Are you worried about immediate multi-threaded
changes we introduced, future developers abusing the access, or the JVM not
performing the right optimizations without the benefit of {{final}} guidance?
> Avro schemas with records that have a field of themselves fail to parse,
> causing stackoverflow exception
> --------------------------------------------------------------------------------------------------------
>
> Key: NIFI-4215
> URL: https://issues.apache.org/jira/browse/NIFI-4215
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 1.4.0
> Reporter: Wesley L Lawrence
> Priority: Minor
> Attachments: nifi-4215.patch
>
>
> Noticed this while attempting to use the AvroSchemaRegsitry with some complex
> schema. Boiled down, Avro lets you define a schema such as;
> {code}
> {
> "namespace": "org.apache.nifi.testing",
> "name": "CompositRecord",
> "type": "record",
> "fields": [
> {
> "name": "id",
> "type": "int"
> },
> {
> "name": "value",
> "type": "string"
> },
> {
> "name": "parent",
> "type": [
> "null",
> "CompositRecord"
> ]
> }
> ]
> }
> {code}
> The AvroSchemaRegistry (AvroTypeUtil specifically) will fail to parse, and
> generate a stackoverflow exception.
> I've whipped up a fix, tested it out in 1.4.0, and am just running through
> the contrib build before I submit a patch.
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