[jira] [Created] (IMPALA-8222) Timeout calculation in stress test doesn't make sense

["Tim Armstrong (JIRA)" <ji...@apache.org>]

Tim Armstrong created IMPALA-8222:
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             Summary: Timeout calculation in stress test doesn't make sense
                 Key: IMPALA-8222
                 URL: https://issues.apache.org/jira/browse/IMPALA-8222
             Project: IMPALA
          Issue Type: Bug
          Components: Infrastructure
            Reporter: Tim Armstrong
            Assignee: Tim Armstrong


There is some logic in the stress test that tries to guess what a reasonable timeout for a query is. There are enough fudge factors that the false positive rate is fairly low, but it also doesn't provide much useful coverage unless a query is stuck.

* The number of concurrent queries is calculated at query submission time. E.g. a query that starts before a large batch of other queries is submitted will be given a short timeout multiplier.
* There is no guarantee that performance degrades linearly. E.g. if runtime filters arrive late, we can see much larger perf hits.

We should consider removing the timeout enforcement or at least revisiting it.



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