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Summary: In leveled compaction, try to trivial move more than one files if possible, up to 4 files or max_compaction_bytes. This is to allow higher write throughput for some use cases where data is loaded in sequential order, where appying compaction results is the bottleneck. When pick up a file to compact and it doesn't have overlapping files in the next level, try to expand to the next file if there is still no overlapping. Pull Request resolved: https://github.com/facebook/rocksdb/pull/10190 Test Plan: Add some unit tests. For performance, Try to run ./db_bench_multi_move --benchmarks=fillseq --compression_type=lz4 --write_buffer_size=5000000 --num=100000000 --value_size=1000 -level_compaction_dynamic_level_bytes Together with https://github.com/facebook/rocksdb/pull/10188 , stalling will be eliminated in this benchmark. Reviewed By: jay-zhuang Differential Revision: D37230647 fbshipit-source-id: 42b260f545c46abc5d90335ac2bbfcd09602b549