[jira] [Updated] (AVRO-3077) Ability of select string deserializing mode by configuration

["Emilio Jose Mena Cebrian (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/AVRO-3077?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

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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