@Override
    public boolean init(final SegmentFileOptions opts) {
        if (opts.isNewFile) {
            return loadNewFile(opts);
        } else {
            return loadExistsFile(opts);
        }

    }
Clear data in [startPos, startPos+64).

@param startPos the start position(inclusive)
jraft-core/src/main/java/com/alipay/sofa/jraft/storage/log/SegmentFile.java