[Webkit-unassigned] [Bug 248466] New: [ews] re-run-layout-tests should use results database instead of doing clean-tree runs

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=248466

            Bug ID: 248466
           Summary: [ews] re-run-layout-tests should use results database
                    instead of doing clean-tree runs
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aakash_jain at apple.com

[ews] re-run-layout-tests should use results database instead of doing clean-tree runs.

For example in https://ews-build.webkit.org/#/builders/10/builds/167694 layout-tests step had 4 failures and 3 of them were pre-existing as per results db (see https://ews-build.webkit.org/#/builders/10/builds/167694/steps/16/logs/stdio), but even though the fourth one (streams/readable-stream-default-controller-error.html) wasn't failing in results db, it was actually flaky, and it did not fail in re-run-layout-tests step (https://ews-build.webkit.org/#/builders/10/builds/167694/steps/22/logs/test-failures doesn't have that test failure).

EWS did run-layout-tests-without-change (after compiling webkit) and reached this conclusion, but all that extra compilation and run-layout-tests-without-change could have been avoided, if re-run-layout-tests  consulted results database.

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