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https://issues.apache.org/jira/browse/SPARK-1851?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Wendell updated SPARK-1851:
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Assignee: Sandy Ryza
> Upgrade Avro dependency to 1.7.6 so Spark can read Avro files
> -------------------------------------------------------------
>
> Key: SPARK-1851
> URL: https://issues.apache.org/jira/browse/SPARK-1851
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Sandy Ryza
> Assignee: Sandy Ryza
> Priority: Critical
> Fix For: 1.0.0
>
>
> I tried to set up a basic example getting a Spark job to read an Avro
> container file with Avro specifics. This results in a
> ClassNotFoundException: can't convert GenericData.Record to
> com.cloudera.sparkavro.User.
> The reason is:
> * When creating records, to decide whether to be specific or generic, Avro
> tries to load a class with the name specified in the schema.
> * Initially, executors just have the system jars (which include Avro), and
> load the app jars dynamically with a URLClassLoader that's set as the context
> classloader for the task threads.
> * Avro tries to load the generated classes with
> SpecificData.class.getClassLoader(), which sidesteps this URLClassLoader and
> goes up to the AppClassLoader.
> Avro 1.7.6 has a change (AVRO-987) that falls back to the Thread's context
> classloader when the SpecificData.class.getClassLoader() fails. I tested
> with Avro 1.7.6 and did not observe the problem.
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