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From "Brian Dougan (JIRA)" <>
Subject [jira] [Commented] (CRUNCH-266) AvroSpecificDeepCopier needs to use constructor on SpecificDatumReader that takes a class.
Date Mon, 16 Sep 2013 21:25:52 GMT


Brian Dougan commented on CRUNCH-266:

I had some build issues (apache rat plugin complaining), but it did get past the tests, so
I figured it was good.  I was afraid the classloader hackery in those tests might not be as
portable as I'd hoped.  

We ran it on a few different machines here and all checked out though.

I'll start fixing my build issues, see if I can get a full build without error.
> AvroSpecificDeepCopier needs to use constructor on SpecificDatumReader that takes a class.
> ------------------------------------------------------------------------------------------
>                 Key: CRUNCH-266
>                 URL:
>             Project: Crunch
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.7.0
>            Reporter: Brian Dougan
>            Assignee: Josh Wills
>            Priority: Minor
>         Attachments: CRUNCH-266.patch
> As per, 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
> * 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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