A deep study of the effects and fixes of server-side request races in web applications

Qiu, Zhengyi; Shao, Shudi; Zhao, Qi; Khan, Hassan Ali; Hui, Xinning; Jin, Guoliang

doi:10.1145/3524842.3528463

Proceedings of the 19th International Conference on Mining Software Repositories 2022

DOI: 10.1145/3524842.3528463

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A deep study of the effects and fixes of server-side request races in web applications

Zhengyi Qiu

Shudi Shao

Qi Zhao

et al.

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2023

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Cited by 1 publication

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R ³ : Record-Replay-Retroaction for Database-Backed Applications

Li,

Kraft,

Cafarella

et al. 2023

Proc. VLDB Endow.

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Developers would benefit greatly from time travel: being able to faithfully replay past executions and retroactively execute modified code on past events. Currently, replay and retroaction are impractical because they require expensively capturing fine-grained timing information to reproduce concurrent accesses to shared state. In this paper, we propose practical time travel for database-backed applications , an important class of distributed applications that access shared state through transactions. We present R 3 , a novel Record-Replay-Retroaction tool. R 3 implements a lightweight interceptor to record concurrency information for applications at transaction-level granularity, enabling replay and retroaction with minimal overhead. We address key challenges in both replay and retroaction. First, we design a novel algorithm for faithfully reproducing application requests running with snapshot isolation, allowing R 3 to support most production DBMSs. Second, we develop a retroactive execution mechanism that provides high fidelity with the original trace while supporting nearly arbitrary code modifications. We demonstrate how R 3 simplifies debugging for real, hard-to-reproduce concurrency bugs from popular open-source web applications. We evaluate R 3 using TPC-C and microservice workloads and show that R 3 always-on recording has a small performance overhead (<25% for point queries but <0.1% for complex transactions like in TPC-C) during normal application execution and that R 3 can retroactively execute bugfixed code over recorded traces within 0.11--0.78× of the original execution time.

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R ³ : Record-Replay-Retroaction for Database-Backed Applications

Li,

Kraft,

Cafarella

et al. 2023

Proc. VLDB Endow.

View full text Add to dashboard Cite

show abstract

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A deep study of the effects and fixes of server-side request races in web applications

Cited by 1 publication

References 51 publications

R ³ : Record-Replay-Retroaction for Database-Backed Applications

R ³ : Record-Replay-Retroaction for Database-Backed Applications

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A deep study of the effects and fixes of server-side request races in web applications

Cited by 1 publication

References 51 publications

R 3 : Record-Replay-Retroaction for Database-Backed Applications

R 3 : Record-Replay-Retroaction for Database-Backed Applications

Contact Info

Product

Resources

About

R ³ : Record-Replay-Retroaction for Database-Backed Applications

R ³ : Record-Replay-Retroaction for Database-Backed Applications