[jira] [Created] (IMPALA-8157) Log exceptions from the FrontEnd

["Paul Rogers (JIRA)" <ji...@apache.org>]

Paul Rogers created IMPALA-8157:
-----------------------------------

             Summary: Log exceptions from the FrontEnd
                 Key: IMPALA-8157
                 URL: https://issues.apache.org/jira/browse/IMPALA-8157
             Project: IMPALA
          Issue Type: Improvement
          Components: Frontend
    Affects Versions: Impala 3.1.0
            Reporter: Paul Rogers
            Assignee: Fang-Yu Rao


The BE calls into the FE for a variety of operations. Each of these may fail in expected ways (invalid query, say) or unexpected ways (a code change introduces a null pointer exception.)

At present, the BE logs only the exception, and only at the INFO level. This ticket asks to log all unexpected exceptions at the ERROR level. The basic idea is to extend all FE entry points to do:

{code:java}
try {
  // Do the operation
} catch (ExpectedException e) {
  // Don't log expected exceptions
  throw e;
} catch (Throwable e) {
  LOG.error("Something went wrong", e);
  throw e;
}
{code}

The above code logs all exceptions except for those that are considered expected. The job of this ticket is to:

* Find all the entry points
* Identify which, if any, exceptions are expected
* Add logging code with an error message that identifies the operation

This pattern was tested ad-hoc to find a bug during development and seems to work fine. As. a result, the change is mostly a matter of the above three steps.



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