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In SERVER-24949 we lowered the WiredTiger "close_idle_time" from 27 hours to 10 minutes. As a result, idle file handles may be closed more aggressively. This may have a performance impact for workloads that have long periods of idle activity, since closing idle handles also clears content from the cache.
Consider raising the "close_handle_minimum" threshold, which configures the number of file handles to keep open after a successful sweep, up from 250. This would prevent too many file handles from being closed during a sweep, and would be useful for workloads with a large number of collections and indexes. This may also raise the threshold for how long to keep around handles for dropped collections.
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