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https://issues.apache.org/jira/browse/PIG-98?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12571031#action_12571031
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Pi Song commented on PIG-98:
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Just want to share my thought here.
1. Log messages and application messages are different and should be treated
differently. I am still not quite convinced about the way that logging
framework is used for reporting error messages to user.
2. The interactive error messages in Grunt should be "user-friendly" shell
level error message where in-depth details are logged using logging framework.
3. In case the user wants to see stacktrace in Grunt, that can be optional
(which might be considered on by default as I believe most users are developers
rather than end-users). It can be turned on/off like the way "set debug on"
works.
4. For embedded Pig engine, the PigException thrown from the engine should
contain "User-friendly" error message plus the stacktrace in inner exception
wrapped inside the PigException (Like the way SQLException works in most
languages)
> grunt should show full exception stack
> --------------------------------------
>
> Key: PIG-98
> URL: https://issues.apache.org/jira/browse/PIG-98
> Project: Pig
> Issue Type: Improvement
> Components: grunt
> Reporter: Stefan Groschupf
> Priority: Minor
> Fix For: 0.1.0
>
> Attachments: showStackTrace-20080207.patch
>
>
> I suggest grunt should be more helpful with user errors. I just did one (a
> stupid one) and it took my too long to figure out the problem, since grunts
> error message was just not giving me a good hint:
> grunt> A = LOAD '/pigtestData.tsv' USING PigStorage(',') AS (user,age,cat);
> grunt> B = FILTER A BY cat == 'book';
> grunt> dump B;
> For input string: "book"
> Experts will see that I tried to use == instead of eq, however especially new
> users could get a little confused.
> I see two chances add Error Number and descriptive texts (Oracle style) -
> this quite a lot of work, or for now I suggest to simply dump the full
> exception text.
> At least for this early stage it would developers and users to find problems
> faster.
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