Bottommost level-based compactions in bottom-pri pool
Summary: This feature was introduced for universal compaction in cc01985d. At that point we thought it'd be used only to prevent long-running universal full compactions from blocking short-lived upper-level compactions. Now we have a level compaction user who could benefit from it since they use more expensive compression algorithm in the bottom level. So enable it for level. Closes https://github.com/facebook/rocksdb/pull/3835 Differential Revision: D7957179 Pulled By: ajkr fbshipit-source-id: 177285d2cef3b650b6a4d81dc5db84bc441c9fe4
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