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As we write segments we're not limiting the number of segments they intersect at the next level. Compactions are limited to a fanout's worth of overlapping segments. This means that we can get a compaction where the upper level segment overlapps more than the segments that are part of the compaction. In this case we can't write the remaining upper level items at the lower level because now we can have a level with segments whose keys intersect. Instead we detect this compaction case. We call it sticky because after merging with the lower level segments the remaining items in the upper level need to stick to the upper level. The next time compaction comes around it'll compact the remaining items with the additional lower overlaping segments. Signed-off-by: Zach Brown <zab@versity.com>