[NIFI-4215] Avro schemas with records that have a field of themselves fail to parse, causing stackoverflow exception

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.4.0
• Fix Version/s: 1.4.0
• Assignee: Unassigned
• Reporter: Wesley L Lawrence
• Created: 21/Jul/17 23:35
• Updated: 03/Aug/17 19:14
• Resolved: 03/Aug/17 19:14

Description

Noticed this while attempting to use the AvroSchemaRegsitry with some complex schema. Boiled down, Avro lets you define a schema such as;

{ 
  "namespace": "org.apache.nifi.testing", 
  "name": "CompositRecord", 
  "type": "record", 
  "fields": [ 
    { 
      "name": "id", 
      "type": "int" 
    }, 
    { 
      "name": "value", 
      "type": "string" 
    }, 
    { 
      "name": "parent", 
      "type": [
        "null",
        "CompositRecord"
      ]
    } 
  ] 
}

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.

Issue Links

• links to: GitHub Pull Request #2034
• links to: GitHub Pull Request #2052