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https://issues.apache.org/jira/browse/IMPALA-8025?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16730545#comment-16730545
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Philip Zeyliger commented on IMPALA-8025:
-----------------------------------------
{{run-tests.py}} is a wrapper around {{py.test}}. It's likely you can run the
test directly with {{impala-py.test tests/metadata/test_explain.py -vv -s}} and
get a bit more of what you want.
If we want to always pass {{-vv}} to py.test, the invocation is at and around
https://github.com/apache/impala/blob/master/tests/run-tests.py#L294 .
> End-to-end tests sometimes unhelpfully truncate error output
> ------------------------------------------------------------
>
> Key: IMPALA-8025
> URL: https://issues.apache.org/jira/browse/IMPALA-8025
> Project: IMPALA
> Issue Type: Bug
> Components: Infrastructure
> Affects Versions: Impala 3.1.0
> Reporter: Paul Rogers
> Priority: Minor
>
> Made a change to the DESCRIBE output per IMPALA-8021. This required
> adjustment to {{metadata/test_explain.py}} to account for the change. The
> test encodes a "golden" version in a .test file using a specialized syntax.
> But, when running the test, the output shows the first few lines (which do
> match), then elides the rest:
> {noformat}
> E row_regex:.*mem-estimate=[0-9.]*[A-Z]*B mem-reservation=[0-9.]*[A-Z]*B
> thread-reservation=0 == '| mem-estimate=0B mem-reservation=0B
> thread-reservation=0'
> E Detailed information truncated (45 more lines), use "-vv" to show
> {noformat}
> As it turns out, passing "-vv" to {{tests/run-tests.py}} does not seem to
> pass it to the test program, so that did not work.
> The .xml file for the test contains the same message: output is truncated.
> Same in the .log file.
> So, the question is, how is a developer to figure out the issue if we can't
> see the actual error lines? This is the kind of thing that converts a simple
> task into a multi-hour ordeal.
> Right now, the only solution is to rerun the tests with {{--update_results}}
> flag to {{run-tests.py}}, then hunt down the generated output file.
> Better would be to output the n lines before the error, rather than the first
> n lines.
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