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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5201) getDiagnostics in TaskReport should return exceptions
Date Thu, 19 Mar 2009 10:39:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12683418#action_12683418
] 

Steve Loughran commented on HADOOP-5201:
----------------------------------------

wow, that is a pretty complex bit of reverse-exception parsing. I will put the needs of your
code back in to HADOOP-5348

-you want to get the full stack trace details as StackTraceElements
-you use error codes.


Error codes are good for letting code identifying problems without having a vast tree of classes,
but there is the risk that you are on the slippery SoapFault road, which started off with
an error code and a client/server bit and ended up with a whole chain of user agents. What
may be useful is to allow a serializable exception to include a Map<String,String> into
which code can add facts (hostname, error code), giving you a class that is extensible when
needed, but still easily deserialized.

> 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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