public MongoReader( String dbHost, String dbPort, String dbName, String dbUser, String dbPasswd, String colName, MongoSplit split, String[] readColumns) { this.table = new MongoTable(dbHost, dbPort, dbName, dbUser, dbPasswd, colName); this.split = split; this.readColumns = readColumns; this.cursor = table.findAll(readColumns).batchSize(BATCH_SIZE).skip((int) split.getStart()); if (!split.isLastSplit()) this.cursor.limit((int) split.getLength()); // if it's the last // split,it will read // all records since // $start }