[NIFI-5552] CSVReader Can't Derive Schema from Quoted Headers

• Type: Bug
• Status: Patch Available
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 1.7.1
• Component/s: Extensions
• Assignee: Pierre Villard
• Reporter: Shawn Weeks
• Created: 24/Aug/18 14:28
• Updated: 25/Mar/21 17:50

Description

When deriving the schema from a CSV File Header NiFi is unable to generate a valid schema if the Header Columns are Double Quoted even though the CSVReader is set to handle quotes. Using the nile.csv sample file from https://people.sc.fsu.edu/~jburkardt/data/csv/csv.html results in an Illegal initial character exception in the Avro Schema generator. In this specific case the header did not contain any spaces or special characters though it was case sensitive.

org.apache.avro.SchemaParseException: Illegal initial character: "Flood"
at org.apache.avro.Schema.validateName(Schema.java:1147)
at org.apache.avro.Schema.access$200(Schema.java:81)
at org.apache.avro.Schema$Field.<init>(Schema.java:403)
at org.apache.avro.Schema$Field.<init>(Schema.java:423)
at org.apache.avro.Schema$Field.<init>(Schema.java:415)
at org.apache.nifi.avro.AvroTypeUtil.buildAvroField(AvroTypeUtil.java:123)
at org.apache.nifi.avro.AvroTypeUtil.buildAvroSchema(AvroTypeUtil.java:114)
at org.apache.nifi.avro.AvroTypeUtil.extractAvroSchema(AvroTypeUtil.java:94)
at org.apache.nifi.schema.access.WriteAvroSchemaAttributeStrategy.getAttributes(WriteAvroSchemaAttributeStrategy.java:58)
at org.apache.nifi.json.WriteJsonResult.writeRecord(WriteJsonResult.java:137)
at org.apache.nifi.serialization.AbstractRecordSetWriter.write(AbstractRecordSetWriter.java:59)
at org.apache.nifi.processors.standard.AbstractRecordProcessor$1.process(AbstractRecordProcessor.java:122)
at org.apache.nifi.controller.repository.StandardProcessSession.write(StandardProcessSession.java:2885)
at org.apache.nifi.processors.standard.AbstractRecordProcessor.onTrigger(AbstractRecordProcessor.java:109)
at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1165)
at org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:203)
at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

Issue Links

• links to: GitHub Pull Request #2966
• links to: GitHub Pull Request #2966