Tags: apache/doris
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[improvement](memory) Storage page cache use LRU-K cache, K=2 (#45719) ### What problem does this PR solve? Storage page cache uses plain LRU Cache, occasional batch operations can cause "cache pollution" in plain LRU Cache. This will cause hotspot data to be squeezed out of the cache by non-hotspot data, reduce cache hit rate. In extreme cases, if the number of pages inserted each time is greater than the cache capacity, the cache hit rate will be 0. Introducing LRU-K Cache avoids "cache pollution" in most cases. Last submitted #28794 Similar PR: #23546 Performance test on branch-2.1: 1-FE, 3-BE (32 Core, 128GB Memory) Doris cluster `ssb_sf_1000` all query cost: 18.85s -> 14.44s, 23% improvement `ssb_flat_1000` all query cost: 12.21s -> 8.54s, 30% improvement, cache hit rate 1% -> 40%
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