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From "Paul Rogers (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-5511) Additional UserException categories for internal errors
Date Mon, 15 May 2017 20:47:04 GMT
Paul Rogers created DRILL-5511:
----------------------------------

             Summary: Additional UserException categories for internal errors
                 Key: DRILL-5511
                 URL: https://issues.apache.org/jira/browse/DRILL-5511
             Project: Apache Drill
          Issue Type: Improvement
    Affects Versions: 1.11.0
            Reporter: Paul Rogers
            Assignee: Paul Rogers
            Priority: Minor
             Fix For: 1.11.0


The {{UserException}} class in Drill is the way that Drill passes error conditions from the
server to the client. {{UserException}} groups errors into a number of categories as defined
in [the protobuf definitions|https://github.com/apache/drill/blob/master/protocol/src/main/protobuf/UserBitShared.proto].

As we enhance error handling in operators, it becomes clear that some errors do not fit into
the existing categories. In particular:

* Execution errors: problems related to run-time issues where the cause is not known, or the
error does not fit into an existing category. This might occur, say, if a temporary file fills,
a spill file is deleted or other odd-ball cases.
* Internal error: error that indicates failure of Drill code, invariants or the like. Internal
errors are generally not something wrong with the user's data, query or environment, but rather
something wrong with Drill itself. For example, all {{IllegalStateException}}, {{AssertionError}}
or {{IllegalArgumentException}} errors would map to an internal error.
* Unspecified error: for cases where Drill code caches an exception from a deeper layer, but
we don't know enough about the exception to render a useful categorization. Most often used
in cases of plugins that don't do adequate error handing themselves.



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