question: public static File locateReplicatorLogDir ( ) { if ( replicatorLogDir == null ) { String replicatorLog = System . getProperty ( LOG_DIR ) ; if ( replicatorLog == null ) replicatorLogDir = new File ( locateReplicatorHomeDir ( ) , "log" ) ; else replicatorLogDir = new File ( replicatorLog ) ; if ( ! replicatorLogDir . isDirectory ( ) ) { throw new ServerRuntimeException ( "Replicator log directory does not exist or is invalid: " + replicatorLogDir ) ; } } return replicatorLogDir ; }
target:  Find and return the replicator log directory.