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https://issues.apache.org/jira/browse/IMPALA-5393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon resolved IMPALA-5393.
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Resolution: Fixed
Fix Version/s: Impala 3.3.0
> Regexp should use THREAD_LOCAL context rather than FRAGMENT_LOCAL
> -----------------------------------------------------------------
>
> Key: IMPALA-5393
> URL: https://issues.apache.org/jira/browse/IMPALA-5393
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 2.8.0
> Reporter: Doug Cameron
> Assignee: Todd Lipcon
> Priority: Minor
> Fix For: Impala 3.3.0
>
>
> The RE2 library uses mutex locking around some internal state structures.
> This causes severe lock contention and lack of CPU scaling on the regexp
> string function.
> Switching to THREAD_LOCAL context will remove the contention.
> We could add a query option to select between FRAGMENT_LOCAL vs THREAD_LOCAL
> but that seems overkill as the context is not huge.
>
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