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d55e52223f
The previous logic for concurrent file chunk fetching did not allow for multiple chunks from the same file to be fetched in parallel. The parallelism only allowed to fetch chunks from different files in parallel. This required complex logic on the follower to be aware from which file it was already fetching information, in order to ensure that chunks for the same file would be fetched in sequential order. During benchmarking, this exhibited throughput issues when recovery came towards the end, where it would only be sequentially fetching chunks for the same largest segment file, with throughput considerably going down in a high-latency network as there was no parallelism anymore. The new logic here follows the peer recovery model more closely, and sends multiple requests for the same file in parallel, and then reorders the results as necessary. Benchmarks show that this leads to better overall throughput and the implementation is also simpler.
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