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## Problem The upload queue currently sees significant head-of-line blocking. For example, index uploads act as upload barriers, and for every layer flush we schedule a layer and index upload, which effectively serializes layer uploads. Resolves #10096. ## Summary of changes Allow upload queue operations to bypass the queue if they don't conflict with preceding operations, increasing parallelism. NB: the upload queue currently schedules an explicit barrier after every layer flush as well (see #8550). This must be removed to enable parallelism. This will require a better mechanism for compaction backpressure, see e.g. #8390 or #5415.