Hi, Compaction can merge some very large files together with data that may be completely cold. So yeah caching the whole file just creates pressure to evict useful stuff. In some theories.
In other theories the page cache is flush and scan resistant and should just eat this stuff up without intervention. Sure it might hurt a bit, but it's a bounded amount before the cache stops discarding useful stuff in favor of new stuff that is unproven. If there is a benchmark with this enabled/disabled I haven't seen it. Doesn't mean it doesn't exist though. Ariel On Tue, Oct 18, 2016, at 12:05 PM, Michael Kjellman wrote: > Within a single SegmentedFile? > > On Oct 18, 2016, at 9:02 AM, Ariel Weisberg > <ariel.weisb...@datastax.com<mailto:ariel.weisb...@datastax.com>> wrote: > > With compaction there can be hot and cold data mixed together. >
