Return-Path: 
 <dev-return-3112-apmail-crunch-dev-archive=crunch.apache.org@crunch.apache.org>
X-Original-To: apmail-crunch-dev-archive@www.apache.org
Delivered-To: apmail-crunch-dev-archive@www.apache.org
Received: from mail.apache.org (hermes.apache.org [140.211.11.3])
	by minotaur.apache.org (Postfix) with SMTP id B98B110783
	for <apmail-crunch-dev-archive@www.apache.org>;
 Mon, 16 Sep 2013 18:19:02 +0000 (UTC)
Received: (qmail 13094 invoked by uid 500); 16 Sep 2013 18:18:56 -0000
Delivered-To: apmail-crunch-dev-archive@crunch.apache.org
Received: (qmail 12927 invoked by uid 500); 16 Sep 2013 18:18:54 -0000
Mailing-List: contact dev-help@crunch.apache.org; run by ezmlm
Precedence: bulk
List-Help: <mailto:dev-help@crunch.apache.org>
List-Unsubscribe: <mailto:dev-unsubscribe@crunch.apache.org>
List-Post: <mailto:dev@crunch.apache.org>
List-Id: <dev.crunch.apache.org>
Reply-To: dev@crunch.apache.org
Delivered-To: mailing list dev@crunch.apache.org
Received: (qmail 12802 invoked by uid 500); 16 Sep 2013 18:18:53 -0000
Delivered-To: apmail-incubator-crunch-dev@incubator.apache.org
Received: (qmail 12770 invoked by uid 99); 16 Sep 2013 18:18:53 -0000
Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28)
    by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 16 Sep 2013 18:18:53 +0000
Date: Mon, 16 Sep 2013 18:18:53 +0000 (UTC)
From: "Josh Wills (JIRA)" <jira@apache.org>
To: crunch-dev@incubator.apache.org
Message-ID: <JIRA.12668830.1379355370803.141141.1379355533179@arcas>
In-Reply-To: <JIRA.12668830.1379355370803@arcas>
References: <JIRA.12668830.1379355370803@arcas>
Subject: [jira] [Commented] (CRUNCH-266) AvroSpecificDeepCopier needs to use
 constructor on SpecificDatumReader that takes a class.
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394


    [ https://issues.apache.org/jira/browse/CRUNCH-266?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13768570#comment-13768570 ] 

Josh Wills commented on CRUNCH-266:
-----------------------------------

Man, do I hate that bug. Is the patch we need just a one-liner, or do we need to update Avro as well?
                
> 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).  

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira