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