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https://issues.apache.org/jira/browse/IMPALA-8157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Paul Rogers updated IMPALA-8157:
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Summary: Log exceptions from the front end (was: Log exceptions from the
FrontEnd)
> Log exceptions from the front end
> ---------------------------------
>
> 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
> Priority: Minor
>
> 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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