Github user ericl commented on the issue:
https://github.com/apache/spark/pull/15539
> The biggest problem of this proposal is, invalidating the cache may be
slow if there are a lot of cache entries.
I don't think this is really an issue. Conservatively assuming ~1us per
eviction and one file per partition, we can evict all 250MB of file entries in
~160ms.
I also cleaned up the code a little to better hide the ids from cache users.
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