private void ensureFilesIsMutable() {
                if (!((bitField0_ & 0x00000002) == 0x00000002)) {
                    files_ = new java.util.ArrayList<com.alipay.sofa.jraft.entity.LocalStorageOutter.LocalSnapshotPbMeta.File>(
                        files_);
                    bitField0_ |= 0x00000002;
                }
            }
<code>optional .jraft.SnapshotMeta meta = 1;</code>
jraft-core/src/main/java/com/alipay/sofa/jraft/entity/LocalStorageOutter.java