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https://issues.apache.org/jira/browse/IMPALA-8222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-8222.
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Resolution: Fixed
Fix Version/s: Impala 3.2.0
> 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
> Priority: Major
> Fix For: Impala 3.2.0
>
>
> 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. But an overall job timeout achieves the same thing.
> Some specific issues that the current logic has (and which are tricky to
> solve):
> * 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 revisit it.
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