public Builder mergeMeta(com.alipay.sofa.jraft.entity.LocalFileMetaOutter.LocalFileMeta value) {
                    if (metaBuilder_ == null) {
                        if (((bitField0_ & 0x00000002) == 0x00000002)
                            && meta_ != null
                            && meta_ != com.alipay.sofa.jraft.entity.LocalFileMetaOutter.LocalFileMeta
                                .getDefaultInstance()) {
                            meta_ = com.alipay.sofa.jraft.entity.LocalFileMetaOutter.LocalFileMeta.newBuilder(meta_)
                                .mergeFrom(value).buildPartial();
                        } else {
                            meta_ = value;
                        }
                        onChanged();
                    } else {
                        metaBuilder_.mergeFrom(value);
                    }
                    bitField0_ |= 0x00000002;
                    return this;
                }
<code>optional .jraft.LocalFileMeta meta = 2;</code>
jraft-core/src/main/java/com/alipay/sofa/jraft/entity/LocalStorageOutter.java