[jira] [Assigned] (IMPALA-8316) Update re2 to avoid lock contention

["Todd Lipcon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-8316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon reassigned IMPALA-8316:
-----------------------------------

    Assignee: Todd Lipcon

> Update re2 to avoid lock contention
> -----------------------------------
>
>                 Key: IMPALA-8316
>                 URL: https://issues.apache.org/jira/browse/IMPALA-8316
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Major
>              Labels: perf
>
> I ran the following test query and found that it spent a lot of time in lock contention within the re2 library:
> ```select sum(l_linenumber) from item_20x where regexp_extract(l_shipinstruct, '.*E', 0) like '%E' ;```
> I think this lock contention would happen on any regex that involves backtracking. This was fixed in the re2 library upstream in https://github.com/google/re2/commit/eb00dfdd82015be22086cacc6bf830f72a10e2bc#diff-a60a8d25ed15adf68b94c85775fd3cf7
> We should consider upgrading re2 to the latest release, or if not that, at least cherry-picking this perf fix.



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