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From "Michael Armbrust (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (AVRO-873) SpecificDatumReader should allow users to specify the ClassLoader used.
Date Wed, 10 Aug 2011 02:59:27 GMT

     [ https://issues.apache.org/jira/browse/AVRO-873?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Michael Armbrust updated AVRO-873:

    Status: Patch Available  (was: Open)

Here is a patch the implements the improvement.  Comments or suggestions appreciated.

> SpecificDatumReader should allow users to specify the ClassLoader used.
> -----------------------------------------------------------------------
>                 Key: AVRO-873
>                 URL: https://issues.apache.org/jira/browse/AVRO-873
>             Project: Avro
>          Issue Type: Improvement
>          Components: java
>            Reporter: Michael Armbrust
> Right now SpecificData resolves classes for SpecificRecords by calling Class.forName(),
which uses the ClassLoader used to load the SpecificData class. I believe this makes it impossible
to deserialize into SpecificRecords that are loaded using a different ClassLoader.
> One relatively simple way to fix this limitations involves:
> * Adding a constructor to SpecificData that allows the user to specify a ClassLoader.
> * Changing the current protected constructor of SpecificDatumReader that takes a SpecificData
to be public instead of protected.
> * Changing SpecificDatumReader to actually use the SpecificData that is passed into the

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