Extract .jar and .zip files concurrently, use buffer for all io.Copy operations #779
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We can speed up the extraction of large packages like Spark and Trino by using concurrency since both contain many
.jarfiles. Both.jarand.ziparchives can be extracted in parallel rather than sequentially which is fortuitous in this case since these packages, when fully extracted, amount to somewhere in the neighborhood of ~1e5 files.Additionally, we can improve overall memory usage by using a buffer pool and
io.CopyBufferacross all extraction methods.Finally, I fixed
.xzextractions not using a limit reader which slipped through previous optimizations.