Taking Dropbox as an example, after a file f is edited into a new version \( f^ \) to the cloud. Unfortunately, today delta sync is only available for PC clients and/or mobile apps in state-of-the-art commercial cloud storage services (as detailed in Section 2), but not for the web-the most pervasive and OS-independent access method. Among these efforts, delta sync is of particular importance for its fine granularity (i.e., the client only sends the changed content of a file to the cloud, instead of the entire file), thus achieving significant traffic savings in the presence of users’ file edits. Thus, a lot of efforts have been made to improve their network-level efficiencies, such as batched sync, deferred sync, delta sync, compression, and deduplication. Their popularity brings a large volume of network traffic overhead to both the client and cloud sides. They have not only provided a convenient and pervasive data store for billions of Internet users, but also become a critical component of other online applications. Recent years have witnessed the enormous popularity of cloud storage services, such as Dropbox, Google Drive, iCloud Drive, and Microsoft OneDrive. Skip 1INTRODUCTION Section 1 INTRODUCTION 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. To address them, we strategically devise sync-async code decoupling and streaming compilation, together with Informed In-place File Construction. 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. Make web-based applications enjoy near-native runtime speed without significant cloud-side or client-side changes. In principle, the unique advantages of WASM can 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. 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. Delta synchronization (sync) is crucial to the network-level efficiency of cloud storage services, especially when handling large files with small increments.
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