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https://issues.apache.org/jira/browse/AVRO-3077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Emilio Jose Mena Cebrian updated AVRO-3077:
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Summary: Ability of select string deserializing mode by configuration
(was: Ability of select string deserializing by configuration)
> Ability of select string deserializing mode by configuration
> ------------------------------------------------------------
>
> Key: AVRO-3077
> URL: https://issues.apache.org/jira/browse/AVRO-3077
> Project: Apache Avro
> Issue Type: Improvement
> Components: java
> Affects Versions: 1.10.1
> Reporter: Emilio Jose Mena Cebrian
> Priority: Major
>
> Current Java generator modifies the source schema to add a property to
> describe the way a reader decodes a string. (see AVRO-2918)
> I think this is a design problem. The way a reader deserializes a string
> shouldn't modify the schema (the schema describes the structure of avro
> message, not the way a reader converts to a usable form).
> On the other hand, a reader might require the strings as a CharSequence
> because it knows how to handle them and other as a String.
> The only way to do this now is modifying the schema itself in each reader. If
> you use Avro with other technologies like Kafka (or confluent) It migth be
> non-viable.
>
> I think that the way a reader decodes messages should be specified by the
> reader and It'll be desirable to specify this using a configuration.
>
> Maybe if a System property (like useCustomCoders feature) or something
> similar could be added to modify the default value for String decoding.
> Form GenericDatumReader
>
> {code:java}
> protected Class findStringClass(Schema schema) {
> String name = schema.getProp(GenericData.STRING_PROP);
> if (name == null)
> return CharSequence.class;
> switch (GenericData.StringType.valueOf(name)) {
> case String:
> return String.class;
> default:
> return CharSequence.class;
> }
> }
> {code}
> Maybe adding a "forced" configuration may help: if reader configures string
> representation, use it, if not do it the current way.
>
> And do something similar in SpecificDatumReader
>
>
>
>
>
>
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