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https://issues.apache.org/jira/browse/NIFI-912?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14727356#comment-14727356
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Sean Busbey commented on NIFI-912:
----------------------------------
{code}
+ static final PropertyDescriptor FINGERPRINT_ALGORITHM = new
PropertyDescriptor.Builder()
+ .name("Fingerprint Algorithm")
+ .description("The algorithm used to generate the schema
fingerprint.")
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .allowableValues(CRC_64_AVRO, MD5, SHA_256)
+ .defaultValue(CRC_64_AVRO.getValue())
+ .required(true)
+ .build();
{code}
It would be nice to note that the list of allowed fingerprints come from Avro
practices (per
[javadoc|http://avro.apache.org/docs/1.7.7/api/java/org/apache/avro/SchemaNormalization.html#fingerprint(java.lang.String,
byte%5B%5D)]), presuming we're intentionally limiting the set from the full
possible (that is, anything that
[MessageDigest.getInstance|http://docs.oracle.com/javase/6/docs/api/java/security/MessageDigest.html#getInstance(java.lang.String)]
will return).
> Support extracting metadata from Avro file headers
> --------------------------------------------------
>
> Key: NIFI-912
> URL: https://issues.apache.org/jira/browse/NIFI-912
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Bryan Bende
> Assignee: Bryan Bende
> Priority: Minor
> Fix For: 0.4.0
>
> Attachments: NIFI-912.patch
>
>
> Extract metadata from Avro file headers to FlowFile attributes so that
> downstream processors can make decisions, such as merging together records of
> compatible schemas (i.e. the correlation attribute).
> Information to extract:
> - Schema definition (full, not fp)
> - Schema fingerprint
> - Schema root record name (if schema is a record)
> - Key/value metadata, like compression codec
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