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From "Jeff Hodges (JIRA)" <j...@apache.org>
Subject [jira] Updated: (AVRO-465) C implementation requires you to know a file's schema before reading
Date Mon, 15 Mar 2010 16:18:27 GMT

     [ https://issues.apache.org/jira/browse/AVRO-465?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jeff Hodges updated AVRO-465:

    Attachment: AVRO-465-schema_for_reader.patch

A patch that creates the avro_schema_from_file_reader(avro_file_reader_t reader) function
for bulling the writers_schema out of a avro_file_reader_t. (a.k.a. option 1).

> C implementation requires you to know a file's schema before reading
> --------------------------------------------------------------------
>                 Key: AVRO-465
>                 URL: https://issues.apache.org/jira/browse/AVRO-465
>             Project: Avro
>          Issue Type: Bug
>          Components: c
>    Affects Versions: 1.3.0
>            Reporter: Jeff Hodges
>         Attachments: AVRO-465-schema_for_reader.patch
> The C implementation gives the user no way of reading the objects in a data file without
knowing the file's schema ahead of time.
> While it does fill in the writers_schema part of the avro_file_reader_t on read, this
field is not available to the API as it is left out of avro.h. Two options persent itself:
1) preserve the API as is and add a avro_schema_from_file_reader() function or 2) move the
avro_file_reader_t and avro_file_writer_t structs to avro.h.
> A third option, that I don't approve of, is providing a function that reads from a datafile
but uses the writers_schema in the reader given instead of requiring another schema to be
passed into it. This is problematic because anyone using the API would have fewer debugging
and testing options when dealing with interop datasets. Any problem that occurs might just
be the schema in the file being off, or whatever.

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