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Date: Fri, 30 Mar 2012 21:37:29 +0000 (UTC)
From: "Siddharth Seth (Commented) (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
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Subject: [jira] [Commented] (MAPREDUCE-4067) Replace YarnRemoteException
 with IOException in MRv2 APIs
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-4067?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13242773#comment-13242773 ] 

Siddharth Seth commented on MAPREDUCE-4067:
-------------------------------------------

YarnRemoteException was serializing the actual exception and sending it over the wire. It was missing an unwind method to get the actual exception. IAC - clients should not be expected to unwind and that should've been handled in the RPC layer itself.

Instead of having the APIs throw an IOException, I'd prefer to define a Yarn / HadoopException which extends Exception and can later be sub-classed for more specific exceptions. Also, possibly add error codes to these exceptions as well as to what is sent over the wire. That may make things easier for clients written in other languages. 
                
> Replace YarnRemoteException with IOException in MRv2 APIs
> ---------------------------------------------------------
>
>                 Key: MAPREDUCE-4067
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4067
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>            Reporter: Jitendra Nath Pandey
>            Assignee: Siddharth Seth
>            Priority: Blocker
>
> YarnRemoteException is defined as a generic wrapper for all the exceptions in yarn. I think we should instead throw IOExceptions in the API, which can later be extended for more specialized exceptions without breaking compatibility.

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