private LocalFileMeta.Builder doFastSnapshotSave(final String snapshotPath) throws Exception {
        this.dbOptions.setFastSnapshot(true);
        final Region region = new Region();
        return KVStoreAccessHelper.saveSnapshot(this.kvStore, snapshotPath, region);
    }
-----------------------------------------------
        db size = 10000000
        slow save snapshot time cost: 2552
        slow compressed file size: 41915298
        slow compress time cost: 9173
        slow load snapshot time cost: 5119
        -----------------------------------------------
        db size = 10000000
        fast save snapshot time cost: 524
        fast compressed file size: 41920248
        fast compress time cost: 8807
        fast load snapshot time cost: 3090
        -----------------------------------------------
        db size = 10000000
        sst save snapshot time cost: 4296
        sst compressed file size: 10741032
        sst compress time cost: 2005
        sst load snapshot time cost: 593
        -----------------------------------------------
        db size = 10000000
        slow save snapshot time cost: 2248
        slow compressed file size: 41918551
        slow compress time cost: 8705
        slow load snapshot time cost: 4485
        -----------------------------------------------
        db size = 10000000
        fast save snapshot time cost: 508
        fast compressed file size: 41914702
        fast compress time cost: 8736
        fast load snapshot time cost: 3047
        -----------------------------------------------
        db size = 10000000
        sst save snapshot time cost: 4206
        sst compressed file size: 10741032
        sst compress time cost: 1950
        sst load snapshot time cost: 599
        -----------------------------------------------
        db size = 10000000
        slow save snapshot time cost: 2327
        slow compressed file size: 41916640
        slow compress time cost: 8643
        slow load snapshot time cost: 4590
        -----------------------------------------------
        db size = 10000000
        fast save snapshot time cost: 511
        fast compressed file size: 41914533
        fast compress time cost: 8704
        fast load snapshot time cost: 3013
        -----------------------------------------------
        db size = 10000000
        sst save snapshot time cost: 4253
        sst compressed file size: 10741032
        sst compress time cost: 1947
        sst load snapshot time cost: 590
        -----------------------------------------------
jraft-rheakv/rheakv-core/src/test/java/com/alipay/sofa/jraft/rhea/benchmark/raw/SnapshotBenchmark.java