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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. -- This message was sent by Atlassian JIRA (v7.6.3#76005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-all-unsubscr...@impala.apache.org For additional commands, e-mail: issues-all-h...@impala.apache.org