WebAssembly-based Delta Sync for Cloud Storage Services

Jianwei Zheng, Zhenhua Li, Yuanhui Qiu, Hao Lin, HE Xiao, Yang Li, Yun-Fei Liu
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Abstract

Delta synchronization (sync) is crucial to the network-level efficiency of cloud storage services, especially when handling large files with small increments. Practical delta sync techniques are, however, only available for PC clients and mobile apps, but not web browsers—the most pervasive and OS-independent access method. To bridge this gap, prior work concentrates on either reversing the delta sync protocol or utilizing the native client, all striving around the tradeoffs among efficiency, applicability, and usability and thus forming an “impossible triangle.” Recently, we note the advent of WebAssembly (WASM), a portable binary instruction format that is efficient in both encoding size and load time. In principle, the unique advantages of WASM can make web-based applications enjoy near-native runtime speed without significant cloud-side or client-side changes. Thus, we implement a straightforward WASM-based delta sync solution, WASMrsync, finding its quasi-asynchronous working manner and conventional In-situ Separate Memory Allocation greatly increase sync time and memory usage. To address them, we strategically devise sync-async code decoupling and streaming compilation, together with Informed In-place File Construction. The resulting solution, WASMrsync+, achieves comparable sync time as the state-of-the-art (most efficient) solution with nearly only half of memory usage, letting the “impossible triangle” reach a reconciliation.
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基于webassembly的增量同步云存储服务
增量同步(同步)对于云存储服务的网络级效率至关重要,特别是在处理具有小增量的大文件时。然而,实际的增量同步技术只适用于PC客户端和移动应用程序,而不适用于web浏览器——这是最普遍且与操作系统无关的访问方法。为了弥补这一差距,之前的工作集中在反转增量同步协议或利用本地客户端上,所有这些都围绕着效率、适用性和可用性之间的权衡而努力,从而形成了一个“不可能的三角形”。最近,我们注意到WebAssembly (WASM)的出现,这是一种可移植的二进制指令格式,在编码大小和加载时间上都很有效。原则上,WASM的独特优势可以使基于web的应用程序享受接近本机的运行时速度,而无需进行重大的云端或客户端更改。因此,我们实现了一个简单的基于wasm的增量同步解决方案WASMrsync,发现它的准异步工作方式和传统的原位分离内存分配大大增加了同步时间和内存使用。为了解决这些问题,我们战略性地设计了同步-异步代码解耦和流式编译,以及知情就地文件构建。最终的解决方案WASMrsync+实现了与最先进(最有效)的解决方案相当的同步时间,而内存使用量几乎只有一半,从而使“不可能三角”达成了和解。
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