Brian Dougan created CRUNCH-266:
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Summary: AvroSpecificDeepCopier needs to use constructor on
SpecificDatumReader that takes a class.
Key: CRUNCH-266
URL: https://issues.apache.org/jira/browse/CRUNCH-266
Project: Crunch
Issue Type: Bug
Components: Core
Affects Versions: 0.7.0
Reporter: Brian Dougan
Assignee: Josh Wills
Priority: Minor
As per https://issues.apache.org/jira/browse/AVRO-1240, when the avro jar is in
a parent classloader of the classloader that contains SpecificData classes, a
ClassCastException can occur if you don't use the SpecificDatumReader
constructor that takes a class (and accounts for the classloader).
Since standard hadoop commands seem to use parent classloaders, and avro is
included in the hadoop parent classloader, this issue can be seen if you run a
command from a jar including SpecificData classes that attempts to use them
from the hadoop command (such as materializing a PCollection of avro objects.
It looks like all that is needed is to update AvroSpecificDatumReader to call a
different constructor.
* public SpecificDatumReader(Class<T> c)
To add in more confusion, since avro is an included hadoop dependency, and avro
itself had a bug until 1.7.4, this fix will only work if avro in hadoop has
been updated to 1.7.4 (or is running on a version that has already done this).
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