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Posted to dev@avro.apache.org by "Josh Spiegel (JIRA)" <ji...@apache.org> on 2013/02/27 20:51:14 UTC

[jira] [Created] (AVRO-1262) Provide access to the writer schema from the mapper

Josh Spiegel created AVRO-1262:
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             Summary: Provide access to the writer schema from the mapper
                 Key: AVRO-1262
                 URL: https://issues.apache.org/jira/browse/AVRO-1262
             Project: Avro
          Issue Type: New Feature
          Components: java
    Affects Versions: 1.7.4
            Reporter: Josh Spiegel


When using an Avro InputFormat like AvroKeyInputFormat, the writer schema of the container file should be accessible from the mapper.  This is useful in cases where a reader schema is not specified.  

A workaround is to use FileSplit#getPath() to access the container file and manually pull out the schema.  This workaround is not ideal because internally the writer schema has already been read (see AvroRecordReaderBase#createAvroFileReader(...)) - it is awkward and inefficient for the user to repeat this work.

See also:
http://mail-archives.apache.org/mod_mbox/avro-user/201302.mbox/%3CCAOF3b61nFw4ztOo9Q5pHHtoUDFZ3sRrvEdRGbXGV_cscTqd5LA%40mail.gmail.com%3E


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