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Until there is an automation I regularly remove the local archive file cache. #2971 was a first step towards building that automated cleanup job.
But this time this cleaning actually lead to docs.rs being down.
I couldn't really reproduce it locally, but IMO the reason is likely my locking structure, most likely the
.writelocks queueing up when the local cache is empty.The optimization here is: only use a lock to block for writes.
potential reads just wait until the file exists if there is already a writer downloading the index.
Also we treat broken index as "missing index", so hopefully won't have any problems.
Another optimization is that I pre-allocate the dashmap, since we know we'll add a bunch of entries.