static public String buildKey(String tableId, String key) {
    return String.format(TABLE_ID_PREFIX + ".%s", tableId, key);
  }
Build complete config key for a config item
@param tableId Id of the table
@param key Key for the config item
@return the complete config key
samza-api/src/main/java/org/apache/samza/config/JavaTableConfig.java