private String getCheckpointSegFilePath(final Checkpoint checkpoint) {
        return checkpoint != null ? checkpoint.segFilename : null;
    }
It's wrote position is from start(HEADER_SIZE) but it's not the last file, SHOULD not happen.
jraft-core/src/main/java/com/alipay/sofa/jraft/storage/log/RocksDBSegmentLogStorage.java