Shane's recheck talk proposal Change-Id: I664619151616deed1dd9ad51d3fb10df963084e7

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 | 10:15     | [Qualcomm's Gerrit management overview from Devops/SRE](sessions/devops-qcom.md)
 | 11:00     | [Migration from Gerrit 2.13 to 3.9: Challenges and Lessons](sessions/migrating-from-2.13-to-3.9.md)
 | 12:30     | Lunch & Networking
+| 14:15     | [Repeated Builds During Code Review: The Case of OpenStack](sessions/repeated-builds-during-code-review.md)
 | 17:00     | End of the day
 
 ### Friday 11th October

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+# Repeated Builds During Code Review: The Case of OpenStack
+
+Automated builds produce a noisy signal. Due to non-deterministic (a.k.a.,
+'flaky') behaviour, they can fail when they should have passed. Nevertheless,
+it's not uncommon for software organizations to incorporate automated builds in
+the code review process. In such cases, a failure from an automated build can
+block integration of a change set. To prevent invalid failures from unfairly
+blocking integration, organizations may allow developers to request a 'recheck',
+which repeats the build without updating the change set. While practical, an
+unconstrained recheck command may waste time and resources if it is not applied
+judiciously.
+
+In this talk, I will describe our research on the use of the recheck command in
+66,932 code reviews from the OpenStack community. We quantitatively analyze (i)
+how often build failures are rechecked; (ii) the extent to which invoking
+recheck changes build failure outcomes; and (iii) how much waste is generated by
+invoking recheck. We observe that (i) 55% of code reviews invoke the recheck
+command after a failing build is reported; (ii) invoking the recheck command
+only changes the outcome of a failing build in 42% of the cases; and (iii)
+invoking the recheck command increases review waiting time by an average of
+2,200% and equates to 187.4 compute years of waste—enough compute resources to
+compete with the oldest land living animal on earth.
+
+*[Shane McIntosh, University of Waterloo](../speakers.md#smcintosh)*

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 with different programming languages, such as Scala, Java, NodeJS and related ecosystems.
 
 [LinkedIn](www.linkedin.com/in/fponciroli)
+
+### Shane McIntosh - University of Waterloo {#smcintosh}
+
+Shane McIntosh is the current Ross & Muriel Cheriton Faculty Fellow and an
+Associate Professor in the Cheriton School of Computer Science at the University
+of Waterloo, Canada. At U. Waterloo, Shane directs the Software Repository
+Excavation and Build Engineering Labs (a.k.a., the Software REBELs). Shane and
+his trainees investigate how peer code review can be made more effective, how
+devops pipelines can be made more efficient, and how software can be produced
+with higher quality.
+
+[LinkedIn](www.linkedin.com/in/shane-mcintosh/)