private MCatalog catToMCat(Catalog cat) {
    MCatalog mCat = new MCatalog();
    mCat.setName(normalizeIdentifier(cat.getName()));
    if (cat.isSetDescription()) {
      mCat.setDescription(cat.getDescription());
    }
    mCat.setLocationUri(cat.getLocationUri());
    mCat.setCreateTime(cat.getCreateTime());
    return mCat;
  }
Rolls back the current transaction if it is active
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/ObjectStore.java