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Use a dedicated threadpool for store-gateway requests
Remove the use of a dedicated threadpool for index-header operations because the call overhead is prohibitively expensive. Instead, use a dedicated threadpool for entire store-gateway requests so that the cost of switching between threads is only paid a single time. This allows for isolation in the case of page faults during mmap accesses without too much overhead. Fixes #1804 Signed-off-by: Nick Pillitteri <nick.pillitteri@grafana.com>
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