[jira] Commented: (HADOOP-5201) getDiagnostics in TaskReport should return exceptions

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-5201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683041#action_12683041 ] 

Steve Loughran commented on HADOOP-5201:
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Santhosh, are you trying to read the results in and create a new exception at the far end? Does it get thrown? 

I've started a basic writable exception, but not looked at the back-convert to an exception. It's pretty hard to do this well, and I wouldn't attempt to try and create new exceptions of the same classname as before, instead they'd be some wrapper exception that would be trickier to work with. This is the only way to reliably send failures back over the wire without requiring everyone a both ends to have the same set of JARs, all in perfect sync.

> getDiagnostics in TaskReport should return exceptions
> -----------------------------------------------------
>
>                 Key: HADOOP-5201
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5201
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Santhosh Srinivasan
>
> Currently, getDiagnostics() returns Strings. When exceptions are thrown in user code and/or Hadoop, it would be cleaner to propagate the exception back to the application for better error handling. Hadoop should return the exceptions instead of returning string representations that correspond to printStackTrace() output.

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