private void doAllocateSegment0() throws IOException {
        SegmentFile segFile = allocateNewSegmentFile();
        this.blankSegments.add(new AllocatedResult(segFile));
    }
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