Sandy Ryza created SPARK-1851: --------------------------------- Summary: 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 Priority: Critical
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. -- This message was sent by Atlassian JIRA (v6.2#6252)