question: public static ConfigHistory load ( File root , DBInstanceInfo db ) { File f = new File ( root , db . getDbGroupName ( ) + "_" + db . getHostName ( ) + "_" + db . getPort ( ) + ".cnf" ) ; if ( ! f . exists ( ) ) return null ; FileInputStream in = null ; try { in = new FileInputStream ( f ) ; ConfigHistory ch = new ConfigHistory ( ) ; ch . read ( in ) ; return ch ; } catch ( Exception ex ) { } finally { if ( in != null ) try { in . close ( ) ; } catch ( Exception ex ) { } } return null ; }
target:  Load config history data for specified db