A locking war story
Blog post from Sentry
The migration of JavaScript and SourceMap processing from Python to Rust in the Symbolicator service at Sentry led to initial challenges, including low throughput and backlog issues due to lock contention. The core problem was identified as the need for a &mut reference for Read and Seek operations, which caused contention when sharing a zip::ZipArchive across multiple tasks. The solution involved giving each task its own Mutex-locked copy of the ZipArchive, resolving the contention and improving system performance. However, the frequent decompression of zip archives has emerged as a new bottleneck, suggesting a need for reconsideration of the use of zip archives for tasks requiring frequent access. Despite this, the system's overall architecture remains high-performing, with decompression now being the primary performance constraint.
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